| Nominal Species (n = 997) | Present allocation (n = 997) | Ref. |
|---|---|---|
| Cosmarium abbreviatum Raciborski | Cosmarium abbreviatum | 80701 |
| Cosmarium abbreviatum var. abbreviatum West & G.S West | Cosmarium abbreviatum var. abbreviatum | 80701 |
| Euastrum aboense Elfving | Euastrum aboense | 80701 |
| Cosmarium abruptum P. Lundell | Cosmarium abruptum | 80701 |
| Cosmarium abruptum var. abruptum W. West & G.S. West | Cosmarium abruptum var. abruptum | 80701 |
| Staurastrum acanthastrum W. West & G.S. West | Staurastrum acanthastrum | 80701 |
| Euastrum acanthophorum W.B. Turner | Euastrum acanthophorum | 80701 |
| Xanthidium acanthophorum Nordstedt | Xanthidium acanthophorum | 80701 |
| Staurastrum acarides Nordstedt | Staurastrum acarides | 80701 |
| Staurastrum acarides var. acarides W. West | Staurastrum acarides var. acarides | 80701 |
| Staurastrum acestophorum West & G.S. West | Staurastrum acestophorum | 80701 |
| Cosmarium achondroides G.S. West | Cosmarium achondroides | 80701 |
| Xanthidium aculeatum Ehrenberg | Xanthidium aculeatum | 80701 |
| Cosmarium acutigonum D. B. Williamson | Cosmarium acutigonum | 80701 |
| Cosmarium adoxum W. West & G.S. West | Cosmarium adoxum | 80701 |
| Micrasterias adscendens Nordstedt | Micrasterias adscendens | 80701 |
| Desmidium aequale W. West & G.S. West | Desmidium aequale | 80701 |
| Cosmarium affine Raciborski | Cosmarium affine | 80701 |
| Euastrum affine Ralfs | Euastrum affine | 80701 |
| Cosmarium affine var. affine G.S. West | Cosmarium affine var. affine | 80701 |
| Staurastrum aggeratum Playfair | Staurastrum aggeratum | 80701 |
| Micrasterias alata G.C. Wallich | Micrasterias alata | 80701 |
| Micrasterias alata var. alata A. M. Scott | Micrasterias alata var. alata | 80701 |
| Cosmarium alpestre Roy & Bisset | Cosmarium alpestre | 80701 |
| Phymatodocis alternans Nordstedt | Phymatodocis alternans | 80701 |
| Staurastrum alternans Brébisson | Staurastrum alternans | 80701 |
| Micrasterias americana Ehrenberg ex Ralfs | Micrasterias americana | 80701 |
| Cosmarium amoenum Brébisson | Cosmarium amoenum | 80701 |
| Staurastrum amphidoxon W. West & G.S. West | Staurastrum amphidoxon | 80701 |
| Pleurotaeniopsis ampla Nordstedt | Pleurotaeniopsis ampla | 80701 |
| Cosmarium amplum Nordstedt | Cosmarium amplum | 80701 |
| Euastrum ampullaceum Ralfs | Euastrum ampullaceum | 80701 |
| Staurastrum anatinoides A.M. Scott & Prescott | Staurastrum anatinoides | 80701 |
| Staurastrum anatinum Cooke & Wills | Staurastrum anatinum | 80701 |
| Cosmarium anceps P. Lundell | Cosmarium anceps | 80701 |
| Cosmarium anceps var. anceps West | Cosmarium anceps var. anceps | 80701 |
| Ichthyocercus angloensis W. West & G.S. West | Ichthyocercus angloensis | 80701 |
| Cosmarium angulare L.N. Johnson | Cosmarium angulare | 80701 |
| Cosmarium angulare var. angulare Wade | Cosmarium angulare var. angulare | 80701 |
| Cosmarium angulatum var. angulatum Playfair | Cosmarium angulatum var. angulatum | 80701 |
| Cosmarium angulosum Brébisson | Cosmarium angulosum | 80701 |
| Euastrum angustatum Wittrock | Euastrum angustatum | 80701 |
| Staurastrum anisacanthum A.M. Scott & Prescott | Staurastrum anisacanthum | 80701 |
| Cosmarium anisochondrum Nordstedt | Cosmarium anisochondrum | 80701 |
| Cosmarium anisochondrum var. anisochondrum Playfair | Cosmarium anisochondrum var. anisochondrum | 80701 |
| Micrasterias anomala W.B. Turner | Micrasterias anomala | 80701 |
| Euastrum ansatum Ralfs | Euastrum ansatum | 80701 |
| Micrasterias apiculata var. apiculata W.B. Turner | Micrasterias apiculata var. apiculata | 80701 |
| Xanthidium apiculiferum W. West | Xanthidium apiculiferum | 80701 |
| Staurastrum approximatum W. West & G.S. West | Staurastrum approximatum | 80701 |
| Desmidium aptogonium var. aptogonium W. West & G.S. West | Desmidium aptogonium var. aptogonium | 80701 |
| Desmidium aptogonum Brébisson ex Ralfs | Desmidium aptogonum | 80701 |
| Staurastrum arachne Ralfs ex Ralfs | Staurastrum arachne | 80701 |
| Staurastrum arachne var. arachne W. West & G.S. West | Staurastrum arachne var. arachne | 80701 |
| Staurastrum archerii W. West | Staurastrum archerii | 80701 |
| Staurastrum arctiscon var. arctiscon W. West & G.S. West | Staurastrum arctiscon var. arctiscon | 80701 |
| Cosmarium arctoum Nordstedt | Cosmarium arctoum | 80701 |
| Cosmarium arctoum var. arctoum Raciborski | Cosmarium arctoum var. arctoum | 80701 |
| Staurastrum arcuatum Nordstedt | Staurastrum arcuatum | 80701 |
| Staurastrum armatum Playfair | Staurastrum armatum | 80701 |
| Staurastrum armigerum Brébisson | Staurastrum armigerum | 80701 |
| Cosmarium arnellii Boldt | Cosmarium arnellii | 80701 |
| Staurastrum arnellii Boldt | Staurastrum arnellii | 80701 |
| Cosmarium arnellii var. arnellii R. Grönblad | Cosmarium arnellii var. arnellii | 80701 |
| Staurodesmus asiaticus Compère & ? Bicudo | Staurodesmus asiaticus | 80701 |
| Cosmarium askenasyi Schmidle | Cosmarium askenasyi | 80701 |
| Euastrum asperum Borge | Euastrum asperum | 80701 |
| Staurastrum asperum Brébisson ex Ralfs | Staurastrum asperum | 80701 |
| Cosmarium asphaerosporum Wittrock | Cosmarium asphaerosporum | 80701 |
| Cosmarium asphaerosporum var. asphaerosporum Nordstedt | Cosmarium asphaerosporum var. asphaerosporum | 80701 |
| Staurastrum assurgens Nordstedt | Staurastrum assurgens | 80701 |
| Staurastrum assurgens var. assurgens G.S. West | Staurastrum assurgens var. assurgens | 80701 |
| Staurastrum asterias Nygaard | Staurastrum asterias | 80701 |
| Sphaerozosma aubertianum W. West | Sphaerozosma aubertianum | 80701 |
| Staurastrum auburnense Playfair | Staurastrum auburnense | 80701 |
| Staurastrum aureolatum Playfair | Staurastrum aureolatum | 80701 |
| Cosmarium auriculatum Reinsch | Cosmarium auriculatum | 80701 |
| Ichthyocercus australiensis Playfair | Ichthyocercus australiensis | 80701 |
| Staurastrum avicula Brébisson | Staurastrum avicula | 80701 |
| Staurastrum bacillare Brébisson | Staurastrum bacillare | 80701 |
| Staurastrum bacillare var. bacillare P. Lundell | Staurastrum bacillare var. bacillare | 80701 |
| Docidium baculum Brébisson | Docidium baculum | 80701 |
| Euastrum bainsii D. B. Williamson | Euastrum bainsii | 80701 |
| Staurastrum barbaricum W. West & G.S. West | Staurastrum barbaricum | 80701 |
| Staurastrum barbulae Nygaard | Staurastrum barbulae | 80701 |
| Cosmarium basilicum G.S.West | Cosmarium basilicum | 80701 |
| Docidium basiundatum W. West & G.S. West | Docidium basiundatum | 80701 |
| Pleurotaenium basiundulatum W. West & G.S. West | Pleurotaenium basiundulatum | 80701 |
| Desmidium bengalicum W.B. Turner | Desmidium bengalicum | 80701 |
| Xanthidium bengalicum W.B. Turner | Xanthidium bengalicum | 80701 |
| Staurastrum bibrachiatum Reinsch | Staurastrum bibrachiatum | 80701 |
| Staurastrum bibrachiatum var. bibrachiatum W. West & G.S. West | Staurastrum bibrachiatum var. bibrachiatum | 80701 |
| Staurastrum bicorne Hauptfleisch | Staurastrum bicorne | 80701 |
| Staurastrum bicorne var. bicorne R. Grönblad | Staurastrum bicorne var. bicorne | 80701 |
| Euastrum bidentatum Nägeli | Euastrum bidentatum | 80701 |
| Staurastrum bienneanum Rabenhorst | Staurastrum bienneanum | 80701 |
| Staurastrum bienneanum var. bienneanum Wille | Staurastrum bienneanum var. bienneanum | 80701 |
| Xanthidium bifurcatum var. bifurcatum Playfair | Xanthidium bifurcatum var. bifurcatum | 80701 |
| Staurastrum bifurcum Joshua | Staurastrum bifurcum | 80701 |
| Pleurotaeniopsis bigibbum W. Schmidle | Pleurotaeniopsis bigibbum | 80701 |
| Staurastrum bilobum A.M. Scott & Prescott | Staurastrum bilobum | 80701 |
| Euastrum bimorsum W. West & G.S. West | Euastrum bimorsum | 80701 |
| Cosmarium binerve P. Lundell | Cosmarium binerve | 80701 |
| Cosmarium binum Nordstedt | Cosmarium binum | 80701 |
| Cosmarium binum var. binum Borge | Cosmarium binum var. binum | 80701 |
| Cosmarium bioculatum Brébisson ex Ralfs | Cosmarium bioculatum | 80701 |
| Cosmarium bipapillatum W. West & G.S. West | Cosmarium bipapillatum | 80701 |
| Cosmarium bipunctatum Borgesen | Cosmarium bipunctatum | 80701 |
| Cosmarium bireme Nordstedt | Cosmarium bireme | 80701 |
| Cosmarium biretiforme G.S. West | Cosmarium biretiforme | 80701 |
| Cosmarium biretum Brébisson | Cosmarium biretum | 80701 |
| Cosmarium biretum var. biretum Nordstedt | Cosmarium biretum var. biretum | 80701 |
| Cosmarium bisphaericum Printz | Cosmarium bisphaericum | 80701 |
| Staurastrum bitrapezicum var. bitrapezicum P. Bourrelly & A. Couté | Staurastrum bitrapezicum var. bitrapezicum | 80701 |
| Cosmarium bitriangulum Grönblad | Cosmarium bitriangulum | 80701 |
| Cosmarium bitriangulum var. bitriangulum Willi Krieger & Gerloff | Cosmarium bitriangulum var. bitriangulum | 80701 |
| Euastrum biverrucosum A. A. Gontcharov & M. M. Watanabe | Euastrum biverrucosum | 80701 |
| Staurastrum biwaense var. biwaense G.R. Hegde & S.G. Bharati | Staurastrum biwaense var. biwaense | 80701 |
| Staurastrum bloklandiae Coesel & Jooste | Staurastrum bloklandiae | 80701 |
| Cosmarium blyttii Wille | Cosmarium blyttii | 80701 |
| Cosmarium blyttii var. blyttii Scott ex Croasdale | Cosmarium blyttii var. blyttii | 80701 |
| Cosmarium boeckii Wille | Cosmarium boeckii | 80701 |
| Staurastrum boergesenii Raciborski | Staurastrum boergesenii | 80701 |
| Staurastrum boergesenii var. boergesenii A.M. Scott | Staurastrum boergesenii var. boergesenii | 80701 |
| Staurastrum bohlinianum var. bohlinianum J. Rzicka | Staurastrum bohlinianum var. bohlinianum | 80701 |
| Cosmarium boitierense var. boitierense F.A.C. Kouwets | Cosmarium boitierense var. boitierense | 80701 |
| Euastrum boldtii Schmidle | Euastrum boldtii | 80701 |
| Staurastrum boreale W. West & G.S. West | Staurastrum boreale | 80701 |
| Euastrum borgeanum A.M. Scott & Prescott | Euastrum borgeanum | 80701 |
| Staurastrum botanense Playfair | Staurastrum botanense | 80701 |
| Staurastrum botrophilum Wolle | Staurastrum botrophilum | 80701 |
| Cosmarium botrytis Meneghini ex Ralfs | Cosmarium botrytis | 80701 |
| Staurastrum brachiatum Ralfs | Staurastrum brachiatum | 80701 |
| Staurastrum brachioprominens Bãrgesen | Staurastrum brachioprominens | 80701 |
| Staurastrum brachioprominens var. brachioprominens A.M. Scott & Prescott | Staurastrum brachioprominens var. brachioprominens | 80701 |
| Staurastrum brachycerum Brébisson | Staurastrum brachycerum | 80701 |
| Micrasterias brachyptera P. Lundell | Micrasterias brachyptera | 80701 |
| Staurastrum brasiliense Nordstedt | Staurastrum brasiliense | 80701 |
| Staurastrum brasiliense var. brasiliense W. West & G.S. West | Staurastrum brasiliense var. brasiliense | 80701 |
| Cosmarium braunii Reinsch | Cosmarium braunii | 80701 |
| Cosmarium brebissonii Meneghini ex Ralfs | Cosmarium brebissonii | 80701 |
| Staurastrum brebissonii W. Archer | Staurastrum brebissonii | 80701 |
| Xanthidium brebissonii Ralfs | Xanthidium brebissonii | 80701 |
| Staurastrum brebissonii var. brebissonii West | Staurastrum brebissonii var. brebissonii | 80701 |
| Xanthidium brebissonii var. brebissonii Ralfs | Xanthidium brebissonii var. brebissonii | 80701 |
| Xanthidium brevinasutum Thomasson | Xanthidium brevinasutum | 80701 |
| Cosmarium broomei Thwaites | Cosmarium broomei | 80701 |
| Euastrum bullatum Playfair | Euastrum bullatum | 80701 |
| Xanthidium burkilii W. West & G.S. West | Xanthidium burkilii | 80701 |
| Cosmarium burkillii W. West & G.S. West | Cosmarium burkillii | 80701 |
| Cosmarium burkillii var. burkillii A.M. Scott & Prescott | Cosmarium burkillii var. burkillii | 80701 |
| Docidium burmense Joshua | Docidium burmense | 80701 |
| Hyalotheca burmensis W. West & G.S. West | Hyalotheca burmensis | 80701 |
| Cosmarium caelatum Ralfs | Cosmarium caelatum | 80701 |
| Cosmarium caelatum var. caelatum W. West | Cosmarium caelatum var. caelatum | 80701 |
| Cosmarium calcareum Wittrock | Cosmarium calcareum | 80701 |
| Pleurotaeniopsis caldense Nordstedt | Pleurotaeniopsis caldense | 80701 |
| Pleurotaenium caldense Nordstedt | Pleurotaenium caldense | 80701 |
| Cosmarium callosissimum A.M. Scott & Grönblad | Cosmarium callosissimum | 80701 |
| Cosmarium cambricum Cooke & Wills | Cosmarium cambricum | 80701 |
| Staurastrum campanulatum Playfair | Staurastrum campanulatum | 80701 |
| Cosmarium canaliculatum W. West & G.S. West | Cosmarium canaliculatum | 80701 |
| Cosmarium candianum Delponte | Cosmarium candianum | 80701 |
| Cosmarium capitulum Roy & Bissett | Cosmarium capitulum | 80701 |
| Staurastrum capitulum Brébisson ex Ralfs | Staurastrum capitulum | 80701 |
| Euastrum carduetum var. carduetum Y. Thérézien | Euastrum carduetum var. carduetum | 80701 |
| Cosmarium carinthiacum Lütkem. | Cosmarium carinthiacum | 80701 |
| Xanthidium caulfieldii Scott ex Croasdale | Xanthidium caulfieldii | 80701 |
| Staurastrum cerastes P. Lundell | Staurastrum cerastes | 80701 |
| Micrasterias ceratofera Joshua | Micrasterias ceratofera | 80701 |
| Staurastrum ceratophorum var. ceratophorum P.F.M. Coesel | Staurastrum ceratophorum var. ceratophorum | 80701 |
| Cosmarium ceylanicum West & G.S. West | Cosmarium ceylanicum | 80701 |
| Staurastrum ceylanicum W. West & G.S. West | Staurastrum ceylanicum | 80701 |
| Xanthidium ceylanicum W. West & G.S. West | Xanthidium ceylanicum | 80701 |
| Staurastrum chavesii Bohlin | Staurastrum chavesii | 80701 |
| Staurastrum cingulum var. cingulum G.M. Smith | Staurastrum cingulum var. cingulum | 80701 |
| Cosmarium circulare Reinsch | Cosmarium circulare | 80701 |
| Euastrum circulare Hassall ex Ralfs | Euastrum circulare | 80701 |
| Docidium clavatum Kützing | Docidium clavatum | 80701 |
| Staurastrum claviferum var. claviferum I.M. Franceschini & A. Couté | Staurastrum claviferum var. claviferum | 80701 |
| Cosmarium clepsydra Nordstedt | Cosmarium clepsydra | 80701 |
| Staurastrum clepsydra Nordstedt | Staurastrum clepsydra | 80701 |
| Staurastrum clepsydra var. clepsydra A.M. Scott & Prescott | Staurastrum clepsydra var. clepsydra | 80701 |
| Cosmarium coarctatum W. West | Cosmarium coarctatum | 80701 |
| Desmidium coarctatum Nordstedt | Desmidium coarctatum | 80701 |
| Desmidium coarctatum var. coarctatum West | Desmidium coarctatum var. coarctatum | 80701 |
| Cosmarium collectorense Playfair | Cosmarium collectorense | 80701 |
| Staurastrum colombetoides var. colombetoides Willi Krieger | Staurastrum colombetoides var. colombetoides | 80701 |
| Staurastrum columbetoides W. West & G.S. West | Staurastrum columbetoides | 80701 |
| Cosmarium commissurale Brébisson ex Ralfs | Cosmarium commissurale | 80701 |
| Cosmarium concinnum Reinsch | Cosmarium concinnum | 80701 |
| Xanthidium concinnum W. Archer | Xanthidium concinnum | 80701 |
| Cosmarium concinnum var. concinnum Wille | Cosmarium concinnum var. concinnum | 80701 |
| Xanthidium concinnum var. concinnum W. West | Xanthidium concinnum var. concinnum | 80701 |
| Micrasterias conferta P. Lundell | Micrasterias conferta | 80701 |
| Micrasterias conferta var. conferta Wolle | Micrasterias conferta var. conferta | 80701 |
| Euastrum conicum Playfair | Euastrum conicum | 80701 |
| Euastrum conicum var. conicum Prescott & A.M. Scott | Euastrum conicum var. conicum | 80701 |
| Cosmarium connatum Brébisson | Cosmarium connatum | 80701 |
| Cosmarium connatum var. connatum W. West | Cosmarium connatum var. connatum | 80701 |
| Cosmarium conspersum Ralfs | Cosmarium conspersum | 80701 |
| Cosmarium constrictum Delponte | Cosmarium constrictum | 80701 |
| Cosmocladium constrictum Arch. | Cosmocladium constrictum | 80701 |
| Staurastrum contectum W.B. Turner | Staurastrum contectum | 80701 |
| Staurastrum contectum var. contectum W.B. Turner | Staurastrum contectum var. contectum | 80701 |
| Cosmarium contractiforme Grönblad & Scott | Cosmarium contractiforme | 80701 |
| Cosmarium contractum O. Kirchner | Cosmarium contractum | 80701 |
| Cosmarium controversum W. West | Cosmarium controversum | 80701 |
| Xanthidium controversum W. West & G.S. West | Xanthidium controversum | 80701 |
| Staurodesmus convergens var. convergens Teiling | Staurodesmus convergens var. convergens | 80701 |
| Euastrum coralloides Joshua | Euastrum coralloides | 80701 |
| Euastrum coralloides var. coralloides Lagerheim | Euastrum coralloides var. coralloides | 80701 |
| Cosmarium corbula Brébisson | Cosmarium corbula | 80701 |
| Euastrum cornubiense W. West & G.S. West | Euastrum cornubiense | 80701 |
| Staurastrum cornutum W. Archer | Staurastrum cornutum | 80701 |
| Cosmarium coronatum Wills | Cosmarium coronatum | 80701 |
| Pleurotaenium coroniferum var. coroniferum A.M. Scott & Prescott | Pleurotaenium coroniferum var. coroniferum | 80701 |
| Docidium coronulatum Grunow | Docidium coronulatum | 80701 |
| Pleurotaenium coronulatum Grunow | Pleurotaenium coronulatum | 80701 |
| Cosmarium corribense W. West & G.S. West | Cosmarium corribense | 80701 |
| Cosmarium corriense Bisset | Cosmarium corriense | 80701 |
| Cosmarium corsavaggense Skuja | Cosmarium corsavaggense | 80701 |
| Euastrum cosmarioides West & G.S. West | Euastrum cosmarioides | 80701 |
| Sphaerozosma cosmarioides G.C. Wall. | Sphaerozosma cosmarioides | 80701 |
| Staurastrum cosmarioides Nordstedt | Staurastrum cosmarioides | 80701 |
| Cosmarium costatum Nordstedt | Cosmarium costatum | 80701 |
| Euastrum crassangulatum Børgesen | Euastrum crassangulatum | 80701 |
| Cosmarium crassangulatum var. crassangulatum Ducellier | Cosmarium crassangulatum var. crassangulatum | 80701 |
| Euastrum crassangulatum var. crassangulatum W. West | Euastrum crassangulatum var. crassangulatum | 80701 |
| Euastrum crassicolle P. Lundell | Euastrum crassicolle | 80701 |
| Micrasterias crenata Brébisson ex Ralfs | Micrasterias crenata | 80701 |
| Cosmarium crenatum Ralfs ex Ralfs | Cosmarium crenatum | 80701 |
| Cosmarium crenatum var. crenatum Nordstedt | Cosmarium crenatum var. crenatum | 80701 |
| Cosmarium crenulatum Nägeli | Cosmarium crenulatum | 80701 |
| Staurastrum crenulatum var. crenulatum Messikommer | Staurastrum crenulatum var. crenulatum | 80701 |
| Cosmarium creperum W. West & G.S. West | Cosmarium creperum | 80701 |
| Cosmarium cristatum Ralfs | Cosmarium cristatum | 80701 |
| Xanthidium cristatum Brébisson | Xanthidium cristatum | 80701 |
| Staurastrum cruciforme Playfair | Staurastrum cruciforme | 80701 |
| Cosmarium cucumis Corda ex Ralfs | Cosmarium cucumis | 80701 |
| Staurastrum cumbricum West | Staurastrum cumbricum | 80701 |
| Euastrum cuneatum Jenner | Euastrum cuneatum | 80701 |
| Cosmarium cuneatum var. cuneatum Y.-X. Wei | Cosmarium cuneatum var. cuneatum | 80701 |
| Staurastrum cuniculosum Playfair | Staurastrum cuniculosum | 80701 |
| Cosmarium cupiforme D.B. Williamson | Cosmarium cupiforme | 80701 |
| Staurastrum curvatum var. curvatum Skuja | Staurastrum curvatum var. curvatum | 80701 |
| Euastrum cuspidatum Wolle | Euastrum cuspidatum | 80701 |
| Euastrum cuspidatum var. cuspidatum Forster | Euastrum cuspidatum var. cuspidatum | 80701 |
| Staurastrum cuspidatum var. cuspidatum Gutwinski | Staurastrum cuspidatum var. cuspidatum | 80701 |
| Staurastrum cyathipes Scott & Grönblad | Staurastrum cyathipes | 80701 |
| Staurastrum cyclacanthum W. West & G.S. West | Staurastrum cyclacanthum | 80701 |
| Cosmarium cyclicum P. Lundell | Cosmarium cyclicum | 80701 |
| Cosmarium cyclicum var. cyclicum Nordstedt | Cosmarium cyclicum var. cyclicum | 80701 |
| Cosmarium cylindricoideum A.M. Scott & Prescott | Cosmarium cylindricoideum | 80701 |
| Cosmarium cylindricum Ralfs | Cosmarium cylindricum | 80701 |
| Cosmarium cymatonotophorum West | Cosmarium cymatonotophorum | 80701 |
| Staurastrum cyrtocerum Brébisson | Staurastrum cyrtocerum | 80701 |
| Micrasterias decemdentata var. decemdentata Schmidle | Micrasterias decemdentata var. decemdentata | 80701 |
| Xanthidium decemdenticulatum Playfair | Xanthidium decemdenticulatum | 80701 |
| Cosmarium decoratum W. West & G.S. West | Cosmarium decoratum | 80701 |
| Cosmarium decussiferum var. decussiferum P. Bourrelly & A. Couté | Cosmarium decussiferum var. decussiferum | 80701 |
| Euastrum degii D. B. Williamson | Euastrum degii | 80701 |
| Euastrum deminutum Playfair | Euastrum deminutum | 80701 |
| Micrasterias denticulata Brébisson ex Ralfs | Micrasterias denticulata | 80701 |
| Cosmarium denticulatum Borge | Cosmarium denticulatum | 80701 |
| Euastrum denticulatum F. Gay | Euastrum denticulatum | 80701 |
| Triploceras denticulatum Playfair | Triploceras denticulatum | 80701 |
| Cosmarium dentiferum Corda | Cosmarium dentiferum | 80701 |
| Euastrum didelta Ralfs ex Ralfs | Euastrum didelta | 80701 |
| Euastrum didelta var. didelta Lagerheim | Euastrum didelta var. didelta | 80701 |
| Cosmarium didymochondrum Nordstedt | Cosmarium didymochondrum | 80701 |
| Cosmarium didymoprotupsum W. West & G.S. West | Cosmarium didymoprotupsum | 80701 |
| Cosmarium difficile Lütkemüller | Cosmarium difficile | 80701 |
| Cosmarium difficile var. difficile Lütkem. | Cosmarium difficile var. difficile | 80701 |
| Cosmarium difficillimum Playfair | Cosmarium difficillimum | 80701 |
| Staurastrum digitatum G.S. West | Staurastrum digitatum | 80701 |
| Cosmarium dilatatum J. Lütkemüller | Cosmarium dilatatum | 80701 |
| Staurastrum dilatatum Ehrenberg ex Ralfs | Staurastrum dilatatum | 80701 |
| Cosmarium diplodesmium Skuja | Cosmarium diplodesmium | 80701 |
| Euastrum diplostauron Skuja | Euastrum diplostauron | 80701 |
| Euastrum diplostauron var. diplostauron A.M. Scott & Prescott | Euastrum diplostauron var. diplostauron | 80701 |
| Staurastrum dispar Brébisson | Staurastrum dispar | 80701 |
| Staurastrum disputatum W. West & G.S. West | Staurastrum disputatum | 80701 |
| Hyalotheca dissiliens Brébisson ex Ralfs | Hyalotheca dissiliens | 80701 |
| Staurastrum distentum Wolle | Staurastrum distentum | 80701 |
| Cosmarium distichum Nordstedt | Cosmarium distichum | 80701 |
| Cosmarium distichum var. distichum Raciborski | Cosmarium distichum var. distichum | 80701 |
| Euastrum divaricatum P. Lundell | Euastrum divaricatum | 80701 |
| Euastrum divergens Joshua | Euastrum divergens | 80701 |
| Euastrum divergens var. divergens M.F. Rich | Euastrum divergens var. divergens | 80701 |
| Staurastrum donardense W. West & G.S. West | Staurastrum donardense | 80701 |
| Staurastrum dorsidentiferum W. West & G.S. West | Staurastrum dorsidentiferum | 80701 |
| Micrasterias doveri Biswas | Micrasterias doveri | 80701 |
| Cosmarium dovrense Wittrock | Cosmarium dovrense | 80701 |
| Staurastrum duacense W. West & G.S. West | Staurastrum duacense | 80701 |
| Hyalotheca dubia Kützing ex Ralfs | Hyalotheca dubia | 80701 |
| Hyalotheca dubia var. dubia Hansgirg | Hyalotheca dubia var. dubia | 80701 |
| Cosmarium dubium Borge | Cosmarium dubium | 80701 |
| Euastrum dubium Nägeli | Euastrum dubium | 80701 |
| Staurastrum dubium W. West | Staurastrum dubium | 80701 |
| Cosmarium dybowskii Gutwinski | Cosmarium dybowskii | 80701 |
| Staurastrum eboracense W.B. Turner | Staurastrum eboracense | 80701 |
| Staurastrum echinodermum W. West & G.S. West | Staurastrum echinodermum | 80701 |
| Cosmarium eductum Roy & Bisset | Cosmarium eductum | 80701 |
| Pleurotaenium elatum Borge | Pleurotaenium elatum | 80701 |
| Sphaerozosma elegans Corda ex Ralfs | Sphaerozosma elegans | 80701 |
| Staurastrum elegans Borge | Staurastrum elegans | 80701 |
| Cosmarium elegantissimum P. Lundell | Cosmarium elegantissimum | 80701 |
| Staurastrum elegantissimum var. elegantissimum K. Förster | Staurastrum elegantissimum var. elegantissimum | 80701 |
| Spondylosium ellipticum W. West & G.S. West | Spondylosium ellipticum | 80701 |
| Staurastrum ellipticum W. West | Staurastrum ellipticum | 80701 |
| Staurastrum elongatum Bark. | Staurastrum elongatum | 80701 |
| Staurastrum emaciatum A.M. Scott & Prescott | Staurastrum emaciatum | 80701 |
| Euastrum engleri var. engleri Bourrelly | Euastrum engleri var. engleri | 80701 |
| Staurastrum ensiferum W.B. Turner | Staurastrum ensiferum | 80701 |
| Cosmarium entochondrum W. West & G.S. West | Cosmarium entochondrum | 80701 |
| Staurastrum erasum Brébisson | Staurastrum erasum | 80701 |
| Euastrum erosum P. Lundell | Euastrum erosum | 80701 |
| Euastrum erosum var. erosum Cedercreutz | Euastrum erosum var. erosum | 80701 |
| Cosmarium etchachanense Roy & Bisset | Cosmarium etchachanense | 80701 |
| Tetmemorus euastroides A.M. Scott & Prescott | Tetmemorus euastroides | 80701 |
| Micrasterias euastroides var. euastroides Nordstedt | Micrasterias euastroides var. euastroides | 80701 |
| Euastrum evolutum var. evolutum A.M. Scott & Prescott | Euastrum evolutum var. evolutum | 80701 |
| Cosmarium exasperatum Joshua | Cosmarium exasperatum | 80701 |
| Cosmarium exasperatum var. exasperatum A.M. Scott & Prescott | Cosmarium exasperatum var. exasperatum | 80701 |
| Cosmarium excavatum Nordstedt | Cosmarium excavatum | 80701 |
| Staurastrum excavatum W. West & G.S. West | Staurastrum excavatum | 80701 |
| Cosmarium exiguum W. Archer | Cosmarium exiguum | 80701 |
| Euastrum exile Joshua | Euastrum exile | 80701 |
| Euastrum exile var. exile A.M. Scott & Prescott | Euastrum exile var. exile | 80701 |
| Staurastrum exporrectum A.M. Scott & Prescott | Staurastrum exporrectum | 80701 |
| Xanthidium fasciculatum Ehrenberg ex Ralfs | Xanthidium fasciculatum | 80701 |
| Cosmarium fastidiosum W. West & G.S. West | Cosmarium fastidiosum | 80701 |
| Cosmarium favum W. West & G.S. West | Cosmarium favum | 80701 |
| Cosmarium fictopraemorsum Kurt Först. | Cosmarium fictopraemorsum | 80701 |
| Micrasterias fimbriata Ralfs | Micrasterias fimbriata | 80701 |
| Micrasterias fimbriata var. fimbriata Willi Krieger | Micrasterias fimbriata var. fimbriata | 80701 |
| Cosmarium flavum Roy & Bisset | Cosmarium flavum | 80701 |
| Staurastrum floriferum W. West & G.S. West | Staurastrum floriferum | 80701 |
| Cosmarium fluviatile Playfair | Cosmarium fluviatile | 80701 |
| Micrasterias foliacea Bailey ex Ralfs | Micrasterias foliacea | 80701 |
| Micrasterias foliacea var. foliacea Nordstedt | Micrasterias foliacea var. foliacea | 80701 |
| Staurastrum fontense Playfair | Staurastrum fontense | 80701 |
| Cosmarium fontigenum Nordstedt | Cosmarium fontigenum | 80701 |
| Staurastrum forficulatum P. Lundell | Staurastrum forficulatum | 80701 |
| Cosmarium formosulum Hoff | Cosmarium formosulum | 80701 |
| Staurastrum formosum C. Bernard | Staurastrum formosum | 80701 |
| Cosmarium formulosum W.E. Hoffmann ex Nordsted | Cosmarium formulosum | 80701 |
| Staurastrum franconicum Reinsch | Staurastrum franconicum | 80701 |
| Staurastrum freemanii W. West & G.S. West | Staurastrum freemanii | 80701 |
| Micrasterias furcata C. Agardh ex Ralfs | Micrasterias furcata | 80701 |
| Micrasterias furcata var. furcata Willi Krieger | Micrasterias furcata var. furcata | 80701 |
| Cosmarium furcatospermum W. West & G.S. West | Cosmarium furcatospermum | 80701 |
| Cosmarium fusum Roy & Bisset | Cosmarium fusum | 80701 |
| Staurastrum galeatum W.B. Turner | Staurastrum galeatum | 80701 |
| Cosmarium galeritum Nordstedt | Cosmarium galeritum | 80701 |
| Cosmarium garrolense Roy & Bisset | Cosmarium garrolense | 80701 |
| Staurastrum gatniense W. West & G.S. West | Staurastrum gatniense | 80701 |
| Cosmarium gayanum De Toni | Cosmarium gayanum | 80701 |
| Euastrum gayanum De Toni | Euastrum gayanum | 80701 |
| Cosmarium gayanum var. gayanum W. West & G.S. West | Cosmarium gayanum var. gayanum | 80701 |
| Cosmarium geminatum P. Lundell | Cosmarium geminatum | 80701 |
| Actinotaenium geniculatum F. A. C. Kouwets | Actinotaenium geniculatum | 80701 |
| Cosmarium geometricum W. West & G.S. West | Cosmarium geometricum | 80701 |
| Xanthidium gerloffii A. Couté & Tell | Xanthidium gerloffii | 80701 |
| Staurodesmus gibberulus var. gibberulus Thomasson | Staurodesmus gibberulus var. gibberulus | 80701 |
| Staurastrum gladiosum W.B. Turner | Staurastrum gladiosum | 80701 |
| Cosmarium glyptodermum G.S. West | Cosmarium glyptodermum | 80701 |
| Cosmarium glyptodermum var. glyptodermum A.M. Scott & Prescott | Cosmarium glyptodermum var. glyptodermum | 80701 |
| Cosmarium goniodes W. West & G.S. West | Cosmarium goniodes | 80701 |
| Cosmarium gonoides W. West & G.S. West | Cosmarium gonoides | 80701 |
| Cosmarium gonoides var. gonoides W. West & G.S. West | Cosmarium gonoides var. gonoides | 80701 |
| Staurastrum gracile Ralfs | Staurastrum gracile | 80701 |
| Triploceras gracile Bailey | Triploceras gracile | 80701 |
| Docidium gracile var. gracile Nordstedt | Docidium gracile var. gracile | 80701 |
| Cosmarium granatum Brébisson | Cosmarium granatum | 80701 |
| Staurastrum grande Bulnhein | Staurastrum grande | 80701 |
| Staurastrum grande var. grande W. West & G.S. West | Staurastrum grande var. grande | 80701 |
| Cosmarium grantii Roy & Bisset | Cosmarium grantii | 80701 |
| Cosmarium granulatum W. West | Cosmarium granulatum | 80701 |
| Tetmemorus granulatus Brébisson | Tetmemorus granulatus | 80701 |
| Cosmarium granuluscum J. Roy & Bisset | Cosmarium granuluscum | 80701 |
| Amscottia gulungulana H.U. Ling & P.A. Tyler | Amscottia gulungulana | 80701 |
| Staurastrum gutwinskii C. Bernard | Staurastrum gutwinskii | 80701 |
| Staurastrum haaboeliense Wille | Staurastrum haaboeliense | 80701 |
| Cosmarium hammeri Reinsch | Cosmarium hammeri | 80701 |
| Staurastrum hantzschii var. hantzschii H.S. Kim | Staurastrum hantzschii var. hantzschii | 80701 |
| Cosmarium hardyi G.S. West | Cosmarium hardyi | 80701 |
| Micrasterias hardyi G.S. West | Micrasterias hardyi | 80701 |
| Staurastrum hardyi G.S. West | Staurastrum hardyi | 80701 |
| Xanthidium hastiferum W.B. Turner | Xanthidium hastiferum | 80701 |
| Xanthidium hastiferum var. hastiferum Nordstedt | Xanthidium hastiferum var. hastiferum | 80701 |
| Staurastrum heimerlianum Lütkemüller | Staurastrum heimerlianum | 80701 |
| Cosmarium helcangulare Nordstedt | Cosmarium helcangulare | 80701 |
| Staurastrum hexacerum var. hexacerum W. West & G.S. West | Staurastrum hexacerum var. hexacerum | 80701 |
| Xanthidium hexagonum Playfair | Xanthidium hexagonum | 80701 |
| Cosmarium hexalobum Nordstedt | Cosmarium hexalobum | 80701 |
| Cosmarium hexalobum var. hexalobum Roy & Bisset | Cosmarium hexalobum var. hexalobum | 80701 |
| Hyalotheca hians Nordstedt | Hyalotheca hians | 80701 |
| Micrasterias hieronymusii Schmidle | Micrasterias hieronymusii | 80701 |
| Staurastrum hirsutum Ehrenberg ex Brébisson | Staurastrum hirsutum | 80701 |
| Xanthidium hirsutum Ehrenberg | Xanthidium hirsutum | 80701 |
| Cosmarium holmiense P. Lundell | Cosmarium holmiense | 80701 |
| Staurastrum horametrum Roy & Bisset | Staurastrum horametrum | 80701 |
| Euastrum horikawae Hinode | Euastrum horikawae | 80701 |
| Docidium horridum Borge | Docidium horridum | 80701 |
| Euastrum humerosum Ralfs | Euastrum humerosum | 80701 |
| Staurastrum hypacanthum A.M. Scott & Prescott | Staurastrum hypacanthum | 80701 |
| Pleurotaenium hypocymatium var. hypocymatium W. West & G. S. West | Pleurotaenium hypocymatium var. hypocymatium | 80701 |
| Staurastrum hystrix Ralfs ex Ralfs | Staurastrum hystrix | 80701 |
| Cosmoastrum hystrix var. hystrix G.H. Tomaszewicz | Cosmoastrum hystrix var. hystrix | 80701 |
| Staurastrum hystrix var. hystrix Lütkemüller | Staurastrum hystrix var. hystrix | 80701 |
| Cosmarium impressulum Elfving | Cosmarium impressulum | 80701 |
| Xanthidium inchoatum Nordstedt | Xanthidium inchoatum | 80701 |
| Xanthidium inchoatum var. inchoatum Playfair | Xanthidium inchoatum var. inchoatum | 80701 |
| Micrasterias incisa Brébisson | Micrasterias incisa | 80701 |
| Micrasterias incisa var. incisa W.B. Turner | Micrasterias incisa var. incisa | 80701 |
| Cosmarium incognitum Playfair | Cosmarium incognitum | 80701 |
| Cosmarium inconspicuum W. West & G.S. West | Cosmarium inconspicuum | 80701 |
| Staurastrum inconspicuum Nordstedt | Staurastrum inconspicuum | 80701 |
| Cosmarium incrassatum var. incrassatum K. Förster | Cosmarium incrassatum var. incrassatum | 80701 |
| Cosmarium indentatum var. indentatum A.M. Scott & Prescott | Cosmarium indentatum var. indentatum | 80701 |
| Hyalotheca indica W.B. Turner | Hyalotheca indica | 80701 |
| Hyalotheca indica var. indica Gutwinski | Hyalotheca indica var. indica | 80701 |
| Micrasterias indica var. indica W.B. Turner | Micrasterias indica var. indica | 80701 |
| Staurastrum inflatum W. West & G.S. West | Staurastrum inflatum | 80701 |
| Staurastrum inflexum Brébisson | Staurastrum inflexum | 80701 |
| Euastrum insigne Hassall ex Ralfs | Euastrum insigne | 80701 |
| Euastrum insulare var. insulare Messik. | Euastrum insulare var. insulare | 80701 |
| Cosmarium intermedium Delponte | Cosmarium intermedium | 80701 |
| Euastrum intermedium Cleve | Euastrum intermedium | 80701 |
| Staurastrum ionatum Wolle | Staurastrum ionatum | 80701 |
| Staurastrum iotanum Wolle | Staurastrum iotanum | 80701 |
| Phymatodocis irregulare Schmidle | Phymatodocis irregulare | 80701 |
| Phymatodocis irregulare var. irregulare Gutwinski | Phymatodocis irregulare var. irregulare | 80701 |
| Cosmarium isthmium W. West | Cosmarium isthmium | 80701 |
| Cosmarium isthmium var. isthmium Schmidle | Cosmarium isthmium var. isthmium | 80701 |
| Cosmarium isthmochondrum Nordstedt | Cosmarium isthmochondrum | 80701 |
| Staurastrum iversenii var. iversenii A.M. Scott & R. Grönblad | Staurastrum iversenii var. iversenii | 80701 |
| Xanthidium japonicum M. Hirano | Xanthidium japonicum | 80701 |
| Cosmarium jenisejense Boldt | Cosmarium jenisejense | 80701 |
| Cosmarium jenisejense var. jenisejense Playfair | Cosmarium jenisejense var. jenisejense | 80701 |
| Euastrum jenneri W. Archer. | Euastrum jenneri | 80701 |
| Micrasterias jenneri Ralfs | Micrasterias jenneri | 80701 |
| Staurastrum johnsonii W. West & G.S. West | Staurastrum johnsonii | 80701 |
| Staurastrum johnsonii var. johnsonii F.E. Fritsch & M.F. Rich | Staurastrum johnsonii var. johnsonii | 80701 |
| Staurastrum kaiseri Ruzicka Lenzenw. | Staurastrum kaiseri | 80701 |
| Xanthidium kalimantanum A.M. Scott & Prescott | Xanthidium kalimantanum | 80701 |
| Cosmarium kanitzii var. kanitzii R. Grönblad | Cosmarium kanitzii var. kanitzii | 80701 |
| Cosmarium kjellmani Wille | Cosmarium kjellmani | 80701 |
| Cosmarium klebsii Gutwinski | Cosmarium klebsii | 80701 |
| Cosmarium kotilainense Grönblad | Cosmarium kotilainense | 80701 |
| Cosmarium laeve Rabenhorst | Cosmarium laeve | 80701 |
| Onychonema laeve Nordstedt | Onychonema laeve | 80701 |
| Staurastrum laeve Ralfs | Staurastrum laeve | 80701 |
| Staurastrum laeve var. laeve A.M. Scott & R. Grönblad | Staurastrum laeve var. laeve | 80701 |
| Tetmemorus laevis Kützing ex Ralfs | Tetmemorus laevis | 80701 |
| Staurastrum laevispinus Bisset | Staurastrum laevispinus | 80701 |
| Staurastrum laevispinus var. laevispinus G.S. West | Staurastrum laevispinus var. laevispinus | 80701 |
| Staurastrum lanceolatum W. Archer | Staurastrum lanceolatum | 80701 |
| Cosmarium latereprotractum Playfair | Cosmarium latereprotractum | 80701 |
| Cruciangulum lateroprominens D.B. Williamson | Cruciangulum lateroprominens | 80701 |
| Micrasterias laticeps Nordstedt | Micrasterias laticeps | 80701 |
| Euastrum laticolle G.S. West | Euastrum laticolle | 80701 |
| Cosmarium latifrons P. Lundell | Cosmarium latifrons | 80701 |
| Euastrum latipediforme Scott ex Croasdale | Euastrum latipediforme | 80701 |
| Staurastrum latiusculum W. West & G.S. West | Staurastrum latiusculum | 80701 |
| Cosmarium lepidum W. West | Cosmarium lepidum | 80701 |
| Staurastrum lepidum var. lepidum R. Grönblad | Staurastrum lepidum var. lepidum | 80701 |
| Staurastrum leptacanthum Nordstedt | Staurastrum leptacanthum | 80701 |
| Staurastrum leptopus Willi Krieger | Staurastrum leptopus | 80701 |
| Staurastrum leptopus var. leptopus Skuja | Staurastrum leptopus var. leptopus | 80701 |
| Staurastrum libeltii Raciborski | Staurastrum libeltii | 80701 |
| Staurastrum limneticum Schmidle | Staurastrum limneticum | 80701 |
| Staurodesmus lobatus var. lobatus Y. Thérézien | Staurodesmus lobatus var. lobatus | 80701 |
| Cosmarium logiense Bissett | Cosmarium logiense | 80701 |
| Euastrum longicolle Nordstedt | Euastrum longicolle | 80701 |
| Staurastrum longipes var. longipes Teiling | Staurastrum longipes var. longipes | 80701 |
| Staurastrum longiradiatum W. West & G.S. West | Staurastrum longiradiatum | 80701 |
| Staurastrum longiradiatum var. longiradiatum G.S. West | Staurastrum longiradiatum var. longiradiatum | 80701 |
| Staurastrum longispinum var. longispinum Playfair | Staurastrum longispinum var. longispinum | 80701 |
| Euastrum luetkemuelleri F. Ducell. | Euastrum luetkemuelleri | 80701 |
| Staurastrum luetkemuelleri Donat & Ruttner | Staurastrum luetkemuelleri | 80701 |
| Euastrum luetkemuelleri var. luetkemuelleri A.M. Scott & Prescott | Euastrum luetkemuelleri var. luetkemuelleri | 80701 |
| Staurastrum lunatum Ralfs | Staurastrum lunatum | 80701 |
| Cosmarium lundellii Delponte | Cosmarium lundellii | 80701 |
| Micrasterias lux Joshua | Micrasterias lux | 80701 |
| Staurastrum maamense W. Archer | Staurastrum maamense | 80701 |
| Cosmarium magnificum Nordstedt | Cosmarium magnificum | 80701 |
| Micrasterias mahabuleshwarensis J. Hobson | Micrasterias mahabuleshwarensis | 80701 |
| Pleurotaenium mamillatum G.S. West | Pleurotaenium mamillatum | 80701 |
| Staurastrum manfeldtii Delponte | Staurastrum manfeldtii | 80701 |
| Cosmarium mansangense W. West & G.S. West | Cosmarium mansangense | 80701 |
| Cosmarium margaritatum var. margaritatum Willi Krieger | Cosmarium margaritatum var. margaritatum | 80701 |
| Cosmarium margaritiferum Meneghini ex Ralfs | Cosmarium margaritiferum | 80701 |
| Staurastrum maskellii W.B. Turner | Staurastrum maskellii | 80701 |
| Cosmarium medioscrobiculatum W. West & G.S. West | Cosmarium medioscrobiculatum | 80701 |
| Staurastrum megalonotum Ralfs | Staurastrum megalonotum | 80701 |
| Cosmarium melanosporum W. Archer | Cosmarium melanosporum | 80701 |
| Cosmarium meneghinii Brébisson | Cosmarium meneghinii | 80701 |
| Staurastrum meriani Reinsch | Staurastrum meriani | 80701 |
| Staurastrum meriani var. meriani W. West | Staurastrum meriani var. meriani | 80701 |
| Staurastrum micron W. West & G.S. West | Staurastrum micron | 80701 |
| Staurastrum micron var. micron Coesel | Staurastrum micron var. micron | 80701 |
| Cosmarium microsphinctum Nordstedt | Cosmarium microsphinctum | 80701 |
| Cosmarium microsphinctum var. microsphinctum Roy & Bisset | Cosmarium microsphinctum var. microsphinctum | 80701 |
| Cosmarium minimum W. West & G.S. West | Cosmarium minimum | 80701 |
| Cosmarium minutum Delponte | Cosmarium minutum | 80701 |
| Euastrum mirum Behre | Euastrum mirum | 80701 |
| Micrasterias moebii var. moebii Gutwinski | Micrasterias moebii var. moebii | 80701 |
| Cosmarium moerlianum var. moerlianum Borge | Cosmarium moerlianum var. moerlianum | 80701 |
| Staurastrum moniliferum Playfair | Staurastrum moniliferum | 80701 |
| Cosmarium moniliforme Turpin ex Ralfs | Cosmarium moniliforme | 80701 |
| Spondylosium moniliforme P. Lundell | Spondylosium moniliforme | 80701 |
| Cosmarium monochondrum Nordstedt | Cosmarium monochondrum | 80701 |
| Cosmarium monomazum P. Lundell | Cosmarium monomazum | 80701 |
| Cosmarium monomazum var. monomazum Nordstedt | Cosmarium monomazum var. monomazum | 80701 |
| Euastrum montanum W. West & G.S. West | Euastrum montanum | 80701 |
| Staurastrum monticulosum Brébisson | Staurastrum monticulosum | 80701 |
| Staurastrum monticulosum var. monticulosum Playfair | Staurastrum monticulosum var. monticulosum | 80701 |
| Cosmarium morsum W. West | Cosmarium morsum | 80701 |
| Xanthidium multicorne Borge | Xanthidium multicorne | 80701 |
| Cosmarium multigranulatum Prescott & A.M. Scott | Cosmarium multigranulatum | 80701 |
| Staurastrum multinodulosum Grönblad | Staurastrum multinodulosum | 80701 |
| Staurodesmus multinodulosum Grönbald | Staurodesmus multinodulosum | 80701 |
| Cosmarium multiordinatum W. West & G.S. West | Cosmarium multiordinatum | 80701 |
| Cosmarium multiordinatum var. multiordinatum W. West & G.S. West | Cosmarium multiordinatum var. multiordinatum | 80701 |
| Pleurotaenium multitaeniatum var. multitaeniatum D.B. Williamson | Pleurotaenium multitaeniatum var. multitaeniatum | 80701 |
| Cosmarium multituberculatum F.E. Fritsch & M.F. Rich | Cosmarium multituberculatum | 80701 |
| Staurastrum muricum var. muricum Nordstedt | Staurastrum muricum var. muricum | 80701 |
| Cosmarium murrayi Playfair | Cosmarium murrayi | 80701 |
| Staurastrum muticum Brébisson ex Ralfs | Staurastrum muticum | 80701 |
| Staurodesmus muticum Brébisson | Staurodesmus muticum | 80701 |
| Staurodesmus muticum var. muticum G.S. West | Staurodesmus muticum var. muticum | 80701 |
| Cosmarium naegelianum Brébisson | Cosmarium naegelianum | 80701 |
| Cosmarium nagelianum Brébisson | Cosmarium nagelianum | 80701 |
| Cosmarium nasutum Nordstedt | Cosmarium nasutum | 80701 |
| Staurastrum natator W. West | Staurastrum natator | 80701 |
| Cosmarium neapolitanum F. Balsamo | Cosmarium neapolitanum | 80701 |
| Cosmarium neapolitanum var. neapolitanum Schmidle | Cosmarium neapolitanum var. neapolitanum | 80701 |
| Hyalotheca neglecta var. neglecta W.R. Taylor | Hyalotheca neglecta var. neglecta | 80701 |
| Staurastrum neglectum G.S. West | Staurastrum neglectum | 80701 |
| Staurastrum nigrae-silvae Schmidle | Staurastrum nigrae-silvae | 80701 |
| Staurastrum nigrae-silvae var. nigrae-silvae A.M. Scott & Prescott | Staurastrum nigrae-silvae var. nigrae-silvae | 80701 |
| Spondylosium nitens var. nitens W.B. Turner | Spondylosium nitens var. nitens | 80701 |
| Cosmarium nitidulum De Notaris | Cosmarium nitidulum | 80701 |
| Staurastrum nodiferum W.B. Turner | Staurastrum nodiferum | 80701 |
| Staurastrum nodosum W. West & G.S. West | Staurastrum nodosum | 80701 |
| Docidium nodosum var. nodosum Borge | Docidium nodosum var. nodosum | 80701 |
| Staurastrum nodulosum Prescott | Staurastrum nodulosum | 80701 |
| Phymatodocis nordstedtiana Wolle | Phymatodocis nordstedtiana | 80701 |
| Micrasterias nordstedtii Thomasson | Micrasterias nordstedtii | 80701 |
| Cosmarium notabile Brébisson ex de Bary | Cosmarium notabile | 80701 |
| Cosmarium notabile var. notabile Insam & Willi Krieger | Cosmarium notabile var. notabile | 80701 |
| Cosmarium novae-semliae Wille | Cosmarium novae-semliae | 80701 |
| Cosmarium novae-semliae var. novae-semliae Boldt | Cosmarium novae-semliae var. novae-semliae | 80701 |
| Cosmarium nutallii W. West | Cosmarium nutallii | 80701 |
| Cosmarium nymannianum Grunow | Cosmarium nymannianum | 80701 |
| Euastrum obesum Joshua | Euastrum obesum | 80701 |
| Staurodesmus obesus W. West | Staurodesmus obesus | 80701 |
| Cosmarium obliquum Nordstedt | Cosmarium obliquum | 80701 |
| Cosmarium obliquum var. obliquum W. West | Cosmarium obliquum var. obliquum | 80701 |
| Cosmarium oblongum Benn. | Cosmarium oblongum | 80701 |
| Cosmarium obtusatum Schmidle | Cosmarium obtusatum | 80701 |
| Desmidium occidentale W. West & G.S. West | Desmidium occidentale | 80701 |
| Cosmarium ocellatum Eichler & Gutwinski | Cosmarium ocellatum | 80701 |
| Cosmarium ocellatum var. ocellatum W. West & G.S. West | Cosmarium ocellatum var. ocellatum | 80701 |
| Cosmarium ochthodes Nordstedt | Cosmarium ochthodes | 80701 |
| Xanthidium octocorne Ehrenberg ex Ralfs | Xanthidium octocorne | 80701 |
| Staurastrum octodontum Skuja | Staurastrum octodontum | 80701 |
| Euastrum octogibbosum Willi Krieger | Euastrum octogibbosum | 80701 |
| Xanthidium octonarium Nordstedt | Xanthidium octonarium | 80701 |
| Xanthidium octonarium var. octonarium Playfair | Xanthidium octonarium var. octonarium | 80701 |
| Euastrum oculatum var. oculatum J.A. Rino | Euastrum oculatum var. oculatum | 80701 |
| Cosmarium oenpelliense A.M. Scott & Prescott | Cosmarium oenpelliense | 80701 |
| Staurastrum oenpelliense A.M. Scott & Prescott | Staurastrum oenpelliense | 80701 |
| Staurastrum oligacanthum Brébisson ex W. Archer | Staurastrum oligacanthum | 80701 |
| Staurastrum oligacanthum var. oligacanthum W. West | Staurastrum oligacanthum var. oligacanthum | 80701 |
| Cosmarium oligogongrus Reinsch | Cosmarium oligogongrus | 80701 |
| Cosmarium oliveri Schaarschm. | Cosmarium oliveri | 80701 |
| Staurastrum omearii Archer | Staurastrum omearii | 80701 |
| Cosmarium ophelii Prescott & A.M. Scott | Cosmarium ophelii | 80701 |
| Staurastrum ophiura P. Lundell | Staurastrum ophiura | 80701 |
| Staurastrum orbiculare Ralfs | Staurastrum orbiculare | 80701 |
| Cosmarium orbiculatum de Bary | Cosmarium orbiculatum | 80701 |
| Xanthidium orcadense W. West & G.S. West | Xanthidium orcadense | 80701 |
| Cosmarium ornatum Ralfs | Cosmarium ornatum | 80701 |
| Cosmarium ornatum var. ornatum Grönblad | Cosmarium ornatum var. ornatum | 80701 |
| Cosmarium orthogonum Delponte | Cosmarium orthogonum | 80701 |
| Cosmarium orthopunctulatum Schmidle | Cosmarium orthopunctulatum | 80701 |
| Cosmarium orthostichum P. Lundell | Cosmarium orthostichum | 80701 |
| Staurastrum osceolense var. osceolense R. Grönblad | Staurastrum osceolense var. osceolense | 80701 |
| Micrasterias oscitans Ralfs | Micrasterias oscitans | 80701 |
| Cosmarium ovale Ralfs ex Ralfs | Cosmarium ovale | 80701 |
| Cosmarium ovale var. ovale W. West & G.S. West | Cosmarium ovale var. ovale | 80701 |
| Docidium ovatum var. ovatum W.M. Maskell | Docidium ovatum var. ovatum | 80701 |
| Pleurotaenium ovatum var. ovatum K. Möbius | Pleurotaenium ovatum var. ovatum | 80701 |
| Pleurotaenium ovum Nordstedt | Pleurotaenium ovum | 80701 |
| Staurastrum oxyacanthum W. Archer | Staurastrum oxyacanthum | 80701 |
| Staurastrum oxyacanthum var. oxyacanthum Nordstedt | Staurastrum oxyacanthum var. oxyacanthum | 80701 |
| Cosmarium pachydermum P. Lundell | Cosmarium pachydermum | 80701 |
| Staurastrum pachyrhynchum Nordstedt | Staurastrum pachyrhynchum | 80701 |
| Cosmarium panduriforme W.B. Turner | Cosmarium panduriforme | 80701 |
| Micrasterias papillifera Brébisson | Micrasterias papillifera | 80701 |
| Cosmarium papilliferum Schmidle | Cosmarium papilliferum | 80701 |
| Spondylosium papillosum W. West & G.S. West | Spondylosium papillosum | 80701 |
| Staurastrum paradoxum Meyen ex Ralfs | Staurastrum paradoxum | 80701 |
| Staurastrum paradoxum var. paradoxum Playfair | Staurastrum paradoxum var. paradoxum | 80701 |
| Cosmarium paragranatoides Skuja | Cosmarium paragranatoides | 80701 |
| Cosmarium pardalis Cohn | Cosmarium pardalis | 80701 |
| Staurastrum patens W.B. Turner | Staurastrum patens | 80701 |
| Cosmarium paucigranulatum Borge | Cosmarium paucigranulatum | 80701 |
| Euastrum pectinatum var. pectinatum Wittrock | Euastrum pectinatum var. pectinatum | 80701 |
| Staurastrum pelagicum W. West & G.S. West | Staurastrum pelagicum | 80701 |
| Staurastrum pendulum var. pendulum Croasdale | Staurastrum pendulum var. pendulum | 80701 |
| Staurastrum pentacladum Wolle | Staurastrum pentacladum | 80701 |
| Staurastrum pentacrinum Willi Krieger | Staurastrum pentacrinum | 80701 |
| Cosmarium perfissum G.S. West | Cosmarium perfissum | 80701 |
| Cosmarium perforatum P. Lundell | Cosmarium perforatum | 80701 |
| Cosmarium pericymatium Nordstedt | Cosmarium pericymatium | 80701 |
| Cosmarium perigranulatum A.M. Scott & Prescott | Cosmarium perigranulatum | 80701 |
| Xanthidium perissacanthum A.M. Scott & Prescott | Xanthidium perissacanthum | 80701 |
| Cosmocladium perissum Roy & Bisset | Cosmocladium perissum | 80701 |
| Staurastrum peristephes A.M. Scott & Prescott | Staurastrum peristephes | 80701 |
| Cosmarium perpusillum West | Cosmarium perpusillum | 80701 |
| Staurastrum perundulatum Grönblad | Staurastrum perundulatum | 80701 |
| Cosmarium petsamoense Cedercreutz | Cosmarium petsamoense | 80701 |
| Cosmarium phaseolus Brébisson | Cosmarium phaseolus | 80701 |
| Euastrum pictum Børgesen | Euastrum pictum | 80701 |
| Staurastrum picum W. West & G.S. West | Staurastrum picum | 80701 |
| Staurastrum pileolatum Brébisson ex Ralfs | Staurastrum pileolatum | 80701 |
| Staurastrum pileolatum var. pileolatum Lütkem. | Staurastrum pileolatum var. pileolatum | 80701 |
| Staurastrum pilosellum W. West & G.S. West | Staurastrum pilosellum | 80701 |
| Xanthidium pilosum Ehrenberg | Xanthidium pilosum | 80701 |
| Staurastrum pingue Teiling | Staurastrum pingue | 80701 |
| Micrasterias pinnatifida Kützing ex Ralfs | Micrasterias pinnatifida | 80701 |
| Micrasterias pinnatifida var. pinnatifida W. West & G.S. West | Micrasterias pinnatifida var. pinnatifida | 80701 |
| Euastrum pinnatum Ralfs | Euastrum pinnatum | 80701 |
| Staurastrum pinnatum W.B. Turner | Staurastrum pinnatum | 80701 |
| Euastrum pinque Elfving | Euastrum pinque | 80701 |
| Staurastrum planctonicum Teiling | Staurastrum planctonicum | 80701 |
| Staurastrum platycerum Joshua | Staurastrum platycerum | 80701 |
| Staurastrum playfairii A.M. Scott & Prescott | Staurastrum playfairii | 80701 |
| Euastrum plesiocoralloides West & G.S. West | Euastrum plesiocoralloides | 80701 |
| Cosmarium plicatum Reinsch | Cosmarium plicatum | 80701 |
| Staurastrum polymorphum Brébisson | Staurastrum polymorphum | 80701 |
| Staurastrum polymorphum var. polymorphum Nygaard | Staurastrum polymorphum var. polymorphum | 80701 |
| Cosmarium porrectum Nordstedt | Cosmarium porrectum | 80701 |
| Cosmarium portianum W. Archer | Cosmarium portianum | 80701 |
| Cosmarium praegrande P. Lundell | Cosmarium praegrande | 80701 |
| Cosmarium praemorsum Brébisson | Cosmarium praemorsum | 80701 |
| Cosmarium prominulum Raciborski | Cosmarium prominulum | 80701 |
| Cosmarium prominulum var. prominulum W. West & G.S. West | Cosmarium prominulum var. prominulum | 80701 |
| Cosmarium promontorium W. West & G.S. West | Cosmarium promontorium | 80701 |
| Staurastrum protectum W. West & G.S. West | Staurastrum protectum | 80701 |
| Cosmarium protomphalum Skuja | Cosmarium protomphalum | 80701 |
| Cosmarium protomphalum var. protomphalum Prescott & A.M. Scott | Cosmarium protomphalum var. protomphalum | 80701 |
| Cosmarium protruberans P. Lundell | Cosmarium protruberans | 80701 |
| Cosmarium protuberans var. protuberans P. Bourrelly & A. Couté | Cosmarium protuberans var. protuberans | 80701 |
| Cosmarium pseudamoenum Wille | Cosmarium pseudamoenum | 80701 |
| Cosmarium pseudamoenum var. pseudamoenum Nordstedt | Cosmarium pseudamoenum var. pseudamoenum | 80701 |
| Cosmarium pseudatlantoideum West | Cosmarium pseudatlantoideum | 80701 |
| Cosmarium pseudoamoenum Wille | Cosmarium pseudoamoenum | 80701 |
| Cosmarium pseudoarmatum A.M. Scott & Prescott | Cosmarium pseudoarmatum | 80701 |
| Cosmarium pseudobiremum Boldt | Cosmarium pseudobiremum | 80701 |
| Staurastrum pseudobiretum Playfair | Staurastrum pseudobiretum | 80701 |
| Cosmarium pseudobroomei Wolle | Cosmarium pseudobroomei | 80701 |
| Cosmarium pseudoconnatum Nordstedt | Cosmarium pseudoconnatum | 80701 |
| Cosmarium pseudoexiguum Raciborski | Cosmarium pseudoexiguum | 80701 |
| Staurastrum pseudofurcigerum Reinsch | Staurastrum pseudofurcigerum | 80701 |
| Euastrum pseudojenneri A.M. Scott & Prescott | Euastrum pseudojenneri | 80701 |
| Cosmarium pseudoornatum Eichler & Gutwinski | Cosmarium pseudoornatum | 80701 |
| Cosmarium pseudopachydermum Nordstedt | Cosmarium pseudopachydermum | 80701 |
| Staurastrum pseudopelagicum W. West & G.S. West | Staurastrum pseudopelagicum | 80701 |
| Cosmarium pseudophaseolus Bruhl & Biswas | Cosmarium pseudophaseolus | 80701 |
| Cosmarium pseudoprotuberans Kirchner | Cosmarium pseudoprotuberans | 80701 |
| Cosmarium pseudopyramidatum P. Lundell | Cosmarium pseudopyramidatum | 80701 |
| Cosmarium pseudoquadratulum Prescott & A.M. Scott | Cosmarium pseudoquadratulum | 80701 |
| Cosmarium pseudoretusum Ducellier | Cosmarium pseudoretusum | 80701 |
| Cosmarium pseudoscenedesmus West & G.S. West | Cosmarium pseudoscenedesmus | 80701 |
| Staurastrum pseudosebaldi Wille | Staurastrum pseudosebaldi | 80701 |
| Staurastrum pseudosebaldi subsp. pseudosebaldi Nordstedt | Staurastrum pseudosebaldi subsp. pseudosebaldi | 80701 |
| Cosmarium pseudospeciosum Raciborski | Cosmarium pseudospeciosum | 80701 |
| Desmidium pseudostreptonema W. West & G.S. West | Desmidium pseudostreptonema | 80701 |
| Staurastrum pseudosuecicum Prescott & A.M. Scott | Staurastrum pseudosuecicum | 80701 |
| Cosmarium pseudotaxichondrum var. pseudotaxichondrum P. Bourrelly & A. Couté | Cosmarium pseudotaxichondrum var. pseudotaxichondrum | 80701 |
| Euastrum pseudotuddalense var. pseudotuddalense A. Couté & A. Iltis | Euastrum pseudotuddalense var. pseudotuddalense | 80701 |
| Cosmocladium pulchellum Brébisson | Cosmocladium pulchellum | 80701 |
| Euastrum pulchellum Brébisson | Euastrum pulchellum | 80701 |
| Spondylosium pulchellum W. Archer | Spondylosium pulchellum | 80701 |
| Euastrum pulchellum var. pulchellum Grönblad & Scott | Euastrum pulchellum var. pulchellum | 80701 |
| Cosmarium pulcherrimum Nordstedt | Cosmarium pulcherrimum | 80701 |
| Euastrum pulcherrimum W. West & G.S. West | Euastrum pulcherrimum | 80701 |
| Euastrum pulcherrimum var. pulcherrimum A.M. Scott & Prescott | Euastrum pulcherrimum var. pulcherrimum | 80701 |
| Cosmarium punctulatum Brébisson | Cosmarium punctulatum | 80701 |
| Staurastrum pungens Brébisson ex Ralfs | Staurastrum pungens | 80701 |
| Cosmarium pycnochondrum Nordstedt | Cosmarium pycnochondrum | 80701 |
| Cosmarium pygmaeum W. Archer | Cosmarium pygmaeum | 80701 |
| Docidium pygmaeum Playfair | Docidium pygmaeum | 80701 |
| Cosmarium pygmaeum var. pygmaeum Skuja | Cosmarium pygmaeum var. pygmaeum | 80701 |
| Spondylosium pygmaeum var. pygmaeum W. West | Spondylosium pygmaeum var. pygmaeum | 80701 |
| Cosmarium pyramidatum Brébisson | Cosmarium pyramidatum | 80701 |
| Staurastrum pyramidatum W. West & G.S. West | Staurastrum pyramidatum | 80701 |
| Cosmarium pyriforme Nordstedt | Cosmarium pyriforme | 80701 |
| Desmidium quadrangulare Kützing | Desmidium quadrangulare | 80701 |
| Staurastrum quadrangulare Brébisson | Staurastrum quadrangulare | 80701 |
| Desmidium quadrangulatum Ralfs | Desmidium quadrangulatum | 80701 |
| Cosmarium quadratum Ralfs ex Ralfs | Cosmarium quadratum | 80701 |
| Desmidium quadratum Nordstedt | Desmidium quadratum | 80701 |
| Euastrum quadratum Nordstedt | Euastrum quadratum | 80701 |
| Cosmarium quadratum var. quadratum W. West & G.S. West | Cosmarium quadratum var. quadratum | 80701 |
| Euastrum quadriceps Nordstedt | Euastrum quadriceps | 80701 |
| Cosmarium quadridentatum W. West & G.S. West | Cosmarium quadridentatum | 80701 |
| Cosmarium quadrifarium P. Lundell | Cosmarium quadrifarium | 80701 |
| Euastrum quadrilobum var. quadrilobum Y. Thérézien | Euastrum quadrilobum var. quadrilobum | 80701 |
| Cosmarium quadrimamillatum W. West & G.S. West | Cosmarium quadrimamillatum | 80701 |
| Staurastrum quadrispinatum W.B. Turner | Staurastrum quadrispinatum | 80701 |
| Cosmarium quadrum P. Lundell | Cosmarium quadrum | 80701 |
| Cosmarium quadrum var. quadrum Nordstedt | Cosmarium quadrum var. quadrum | 80701 |
| Cosmarium quasillus P. Lundell | Cosmarium quasillus | 80701 |
| Cosmarium quaternarium Wittrock | Cosmarium quaternarium | 80701 |
| Cosmarium quinarium P. Lundell | Cosmarium quinarium | 80701 |
| Micrasterias radians W.B. Turner | Micrasterias radians | 80701 |
| Micrasterias radiosa Ralfs | Micrasterias radiosa | 80701 |
| Cosmarium radiosum Wolle | Cosmarium radiosum | 80701 |
| Cosmarium ralfsii Brébisson | Cosmarium ralfsii | 80701 |
| Staurastrum ravenellii Wood | Staurastrum ravenellii | 80701 |
| Cosmarium rectangulare Grunow | Cosmarium rectangulare | 80701 |
| Staurastrum rectangulare Borge | Staurastrum rectangulare | 80701 |
| Staurastrum rectangulare var. rectangulare A.M. Scott & Prescott | Staurastrum rectangulare var. rectangulare | 80701 |
| Cosmarium rectangulum Reinsch | Cosmarium rectangulum | 80701 |
| Docidium rectum Delponte | Docidium rectum | 80701 |
| Pleurotaeniopsis rectum Delponte | Pleurotaeniopsis rectum | 80701 |
| Cosmarium regnellii Wille | Cosmarium regnellii | 80701 |
| Cosmarium regnellii var. regnellii Eichler & Gutwinski | Cosmarium regnellii var. regnellii | 80701 |
| Cosmarium regnesi var. regnesi W. West | Cosmarium regnesi var. regnesi | 80701 |
| Cosmarium regnesii Reinsch | Cosmarium regnesii | 80701 |
| Xanthidium regulare var. regulare P.F.M. Coesel | Xanthidium regulare var. regulare | 80701 |
| Cosmarium reinschii W. Archer | Cosmarium reinschii | 80701 |
| Cosmarium reinschii var. reinschii W. West & G.S. West | Cosmarium reinschii var. reinschii | 80701 |
| Staurastrum renardii Reinsch | Staurastrum renardii | 80701 |
| Staurastrum renardii var. renardii Raciborski | Staurastrum renardii var. renardii | 80701 |
| Cosmarium repandum Nordstedt | Cosmarium repandum | 80701 |
| Cosmarium repandum var. repandum D.B. Williamson | Cosmarium repandum var. repandum | 80701 |
| Cosmarium retusiforme var. retusiforme Gutwinski | Cosmarium retusiforme var. retusiforme | 80701 |
| Staurastrum retusum W.B. Turner | Staurastrum retusum | 80701 |
| Staurastrum rhabdophorum Nordstedt | Staurastrum rhabdophorum | 80701 |
| Xanthidium robinsonianum W. Archer | Xanthidium robinsonianum | 80701 |
| Docidium robustum W.B. Turner | Docidium robustum | 80701 |
| Staurastrum rosei Playfair | Staurastrum rosei | 80701 |
| Staurastrum rosei var. rosei A.M. Scott | Staurastrum rosei var. rosei | 80701 |
| Euastrum rostratum var. rostratum Nordstedt | Euastrum rostratum var. rostratum | 80701 |
| Micrasterias rotata var. rotata A.M. Scott & Prescott | Micrasterias rotata var. rotata | 80701 |
| Staurastrum rotula Nordstedt | Staurastrum rotula | 80701 |
| Cosmarium rotundum Prescott & A.M. Scott | Cosmarium rotundum | 80701 |
| Staurastrum rugulosum Brébisson ex Ralfs | Staurastrum rugulosum | 80701 |
| Euastrum sachlanii A.M. Scott & Prescott | Euastrum sachlanii | 80701 |
| Ichthyodontum sachlanii A.M. Scott & Prescott | Ichthyodontum sachlanii | 80701 |
| Staurastrum sagittarium Nordstedt | Staurastrum sagittarium | 80701 |
| Staurastrum saltans Joshua | Staurastrum saltans | 80701 |
| Cosmocladium saxonicum de Bary | Cosmocladium saxonicum | 80701 |
| Staurastrum saxonicum Bulnh. | Staurastrum saxonicum | 80701 |
| Staurastrum scabrum Brébisson | Staurastrum scabrum | 80701 |
| Micrasterias schweinfurthii Cohn | Micrasterias schweinfurthii | 80701 |
| Cosmarium scopularum O. Borge | Cosmarium scopularum | 80701 |
| Cosmarium scoticum W. West & G.S. West | Cosmarium scoticum | 80701 |
| Staurastrum scottii Grönblad | Staurastrum scottii | 80701 |
| Xanthidium scottii Croasdale | Xanthidium scottii | 80701 |
| Staurastrum sebaldi Reinsch | Staurastrum sebaldi | 80701 |
| Cosmarium securiforme Borge | Cosmarium securiforme | 80701 |
| Cosmarium seelyanum Wolle | Cosmarium seelyanum | 80701 |
| Cosmarium seelyanum var. seelyanum Playfair | Cosmarium seelyanum var. seelyanum | 80701 |
| Staurodesmus sellatus Teiling | Staurodesmus sellatus | 80701 |
| Euastrum serratum Joshua | Euastrum serratum | 80701 |
| Triploceras serratum Playfair | Triploceras serratum | 80701 |
| Staurastrum setigerum Cleve | Staurastrum setigerum | 80701 |
| Staurastrum setigerum var. setigerum Grönblad | Staurastrum setigerum var. setigerum | 80701 |
| Cosmarium sexangulare P. Lundell | Cosmarium sexangulare | 80701 |
| Cosmarium sexangulare var. sexangulare Roy & Bisset | Cosmarium sexangulare var. sexangulare | 80701 |
| Staurastrum sexcostatum Brébisson | Staurastrum sexcostatum | 80701 |
| Staurastrum sexcostatum var. sexcostatum W. West | Staurastrum sexcostatum var. sexcostatum | 80701 |
| Xanthidium sexmamillatum W. West & G.S. West | Xanthidium sexmamillatum | 80701 |
| Xanthidium sexmamillatum var. sexmamillatum M.O.P. Iyengar & Bai | Xanthidium sexmamillatum var. sexmamillatum | 80701 |
| Cosmarium sexnotatum Gutwinski | Cosmarium sexnotatum | 80701 |
| Euastrum sibiricum Boldt | Euastrum sibiricum | 80701 |
| Cosmarium simii Roy & Bisset | Cosmarium simii | 80701 |
| Staurastrum simonyi Heimerl | Staurastrum simonyi | 80701 |
| Pleurotaenium simplicissimum Grönblad | Pleurotaenium simplicissimum | 80701 |
| Xanthidium simplicius Nordstedt | Xanthidium simplicius | 80701 |
| Cosmarium sinostegos Schaarschm. | Cosmarium sinostegos | 80701 |
| Cosmarium sinostegos var. sinostegos Gutwinski | Cosmarium sinostegos var. sinostegos | 80701 |
| Staurastrum sinuatum Borge | Staurastrum sinuatum | 80701 |
| Euastrum sinuosum Lenormand ex W. Archer | Euastrum sinuosum | 80701 |
| Staurastrum sirnonyi Heimerl | Staurastrum sirnonyi | 80701 |
| Cosmarium slewdrumense Roy | Cosmarium slewdrumense | 80701 |
| Xanthidium smithii W. Archer | Xanthidium smithii | 80701 |
| Cosmarium smolandicum P. Lundell | Cosmarium smolandicum | 80701 |
| Staurodesmus smolandicus var. smolandicus Thomasson | Staurodesmus smolandicus var. smolandicus | 80701 |
| Cosmarium sniatyniense Gutwinski | Cosmarium sniatyniense | 80701 |
| Cosmarium sniatyniense var. sniatyniense Raciborski | Cosmarium sniatyniense var. sniatyniense | 80701 |
| Micrasterias sol var. sol G.S. West | Micrasterias sol var. sol | 80701 |
| Cosmarium solidum Nordstedt | Cosmarium solidum | 80701 |
| Staurastrum sonthalianum W.B. Turner | Staurastrum sonthalianum | 80701 |
| Cosmarium spechtii A.M. Scott & Prescott | Cosmarium spechtii | 80701 |
| Cosmarium speciosissimum Schmidle | Cosmarium speciosissimum | 80701 |
| Cosmarium speciosissimum var. speciosissimum Nordstedt | Cosmarium speciosissimum var. speciosissimum | 80701 |
| Cosmarium speciosum P. Lundell | Cosmarium speciosum | 80701 |
| Staurodesmus spetsbergensis var. spetsbergensis Teiling | Staurodesmus spetsbergensis var. spetsbergensis | 80701 |
| Cosmarium sphaeroideum W. West | Cosmarium sphaeroideum | 80701 |
| Bambusina sphaerospora A.M. Scott & Grönblad | Bambusina sphaerospora | 80701 |
| Cosmarium sphalerostichum Nordstedt | Cosmarium sphalerostichum | 80701 |
| Euastrum sphyroides Nordstedt | Euastrum sphyroides | 80701 |
| Staurastrum spiniceps Willi Krieger | Staurastrum spiniceps | 80701 |
| Staurastrum spiniferum W. West | Staurastrum spiniferum | 80701 |
| Staurastrum spinipendens A.M. Scott & Prescott | Staurastrum spinipendens | 80701 |
| Staurastrum spinosum Brébisson | Staurastrum spinosum | 80701 |
| Cosmarium spinuliferum W. West & G.S. West | Cosmarium spinuliferum | 80701 |
| Euastrum spinulosum Delponte | Euastrum spinulosum | 80701 |
| Triploceras splendens Prowse | Triploceras splendens | 80701 |
| Staurastrum spongiosum Brébisson ex Ralfs | Staurastrum spongiosum | 80701 |
| Staurastrum spongiosum var. spongiosum W. West | Staurastrum spongiosum var. spongiosum | 80701 |
| Cosmarium sportella Brébisson | Cosmarium sportella | 80701 |
| Cosmarium sportella var. sportella W. West & G.S. West | Cosmarium sportella var. sportella | 80701 |
| Staurastrum stelliferum Borge | Staurastrum stelliferum | 80701 |
| Staurastrum stelliferum var. stelliferum A.M. Scott & Prescott | Staurastrum stelliferum var. stelliferum | 80701 |
| Oocardium stratum Nägeli | Oocardium stratum | 80701 |
| Cosmarium striolatum W. Archer | Cosmarium striolatum | 80701 |
| Cosmarium subalatum W. West & G.S. West | Cosmarium subalatum | 80701 |
| Euastrum subalpinum Messik. | Euastrum subalpinum | 80701 |
| Euastrum subalpinum var. subalpinum Messik. | Euastrum subalpinum var. subalpinum | 80701 |
| Staurastrum subarmigerum Roy & Bisset | Staurastrum subarmigerum | 80701 |
| Cosmarium subaversum Barges. | Cosmarium subaversum | 80701 |
| Staurastrum subavicula W. West & G.S. West | Staurastrum subavicula | 80701 |
| Cosmarium subbinale var. subbinale Playfair | Cosmarium subbinale var. subbinale | 80701 |
| Cosmarium subbroomei Schmidle | Cosmarium subbroomei | 80701 |
| Cosmarium subcapitulum W. West | Cosmarium subcapitulum | 80701 |
| Cosmarium subcontractum W. West & G.S. West | Cosmarium subcontractum | 80701 |
| Pleurotaeniopsis subcoronulatum var. subcoronulatum West & G.S. West | Pleurotaeniopsis subcoronulatum var. subcoronulatum | 80701 |
| Pleurotaenium subcoronulatum var. subcoronulatum W. West & G.S. West | Pleurotaenium subcoronulatum var. subcoronulatum | 80701 |
| Cosmarium subcostatum Nordstedt | Cosmarium subcostatum | 80701 |
| Cosmarium subcrenatum Hantzsch | Cosmarium subcrenatum | 80701 |
| Cosmarium subcrenulatum Hantzsch | Cosmarium subcrenulatum | 80701 |
| Staurastrum subcruciatum Wills | Staurastrum subcruciatum | 80701 |
| Cosmarium subcucumis Schmidle | Cosmarium subcucumis | 80701 |
| Cosmarium subcylindricum W. West | Cosmarium subcylindricum | 80701 |
| Cosmarium subdanicum W. West | Cosmarium subdanicum | 80701 |
| Staurastrum subdenticulatum Nordstedt | Staurastrum subdenticulatum | 80701 |
| Cosmarium subdepressum W. West & G.S. West | Cosmarium subdepressum | 80701 |
| Cosmarium subdistichum Raciborski | Cosmarium subdistichum | 80701 |
| Cosmarium subexcavatum W. West & G.S. West | Cosmarium subexcavatum | 80701 |
| Cosmarium subexcavatum var. subexcavatum W. West & G.S. West | Cosmarium subexcavatum var. subexcavatum | 80701 |
| Staurastrum subgemmulatum W. West & G.S. West | Staurastrum subgemmulatum | 80701 |
| Staurastrum subgracillimum W. West & G.S. West | Staurastrum subgracillimum | 80701 |
| Staurastrum subgrande Borge | Staurastrum subgrande | 80701 |
| Staurastrum subgrande var. subgrande A.M. Scott & Prescott | Staurastrum subgrande var. subgrande | 80701 |
| Xanthidium subhastiferum W. West | Xanthidium subhastiferum | 80701 |
| Xanthidium subhastiferum var. subhastiferum W. West & G.S. West | Xanthidium subhastiferum var. subhastiferum | 80701 |
| Cosmarium subimpressulum O.Borge | Cosmarium subimpressulum | 80701 |
| Euastrum subincisum Reinsch | Euastrum subincisum | 80701 |
| Staurastrum sublaevispinum W. West & G.S. West | Staurastrum sublaevispinum | 80701 |
| Euastrum sublobatum Brébisson | Euastrum sublobatum | 80701 |
| Cosmarium submammilliferum W. West & G.S. West | Cosmarium submammilliferum | 80701 |
| Xanthidium submicracanthum E. A. Flint & D. B. Williamson | Xanthidium submicracanthum | 80701 |
| Staurastrum submonticulosum Roy & Bisset | Staurastrum submonticulosum | 80701 |
| Staurastrum subnudibrachiatum W. West & G.S. West | Staurastrum subnudibrachiatum | 80701 |
| Micrasterias suboblonga Nordstedt | Micrasterias suboblonga | 80701 |
| Micrasterias suboblonga var. suboblonga Willi Krieger | Micrasterias suboblonga var. suboblonga | 80701 |
| Desmidium suboccidentale A.M. Scott & Prescott | Desmidium suboccidentale | 80701 |
| Staurastrum suborbiculare W. West & G.S. West | Staurastrum suborbiculare | 80701 |
| Cosmarium suborthostichum Raciborski | Cosmarium suborthostichum | 80701 |
| Cosmarium subprotumidum Nordstedt | Cosmarium subprotumidum | 80701 |
| Staurodesmus subpygmaeus var. subpygmaeus West | Staurodesmus subpygmaeus var. subpygmaeus | 80701 |
| Cosmarium subquadrans W. West & G.S. West | Cosmarium subquadrans | 80701 |
| Cosmarium subquadratum Wittrock | Cosmarium subquadratum | 80701 |
| Cosmarium subraciborskii Taft | Cosmarium subraciborskii | 80701 |
| Cosmarium subreniforme Nordstedt | Cosmarium subreniforme | 80701 |
| Cosmarium subretusiforme W. West & G.S. West | Cosmarium subretusiforme | 80701 |
| Euastrum subrostratum W. West & G.S. West | Euastrum subrostratum | 80701 |
| Cosmarium subspeciosum Nordstedt | Cosmarium subspeciosum | 80701 |
| Cosmarium subtholiforme var. subtholiforme Schmidle | Cosmarium subtholiforme var. subtholiforme | 80701 |
| Xanthidium subtrilobum W. West & G.S. West | Xanthidium subtrilobum | 80701 |
| Xanthidium subtrilobum var. subtrilobum Skuja | Xanthidium subtrilobum var. subtrilobum | 80701 |
| Cosmarium subtrinodulum W. West & G.S. West | Cosmarium subtrinodulum | 80701 |
| Cosmarium subtriordinatum W. West & G.S. West | Cosmarium subtriordinatum | 80701 |
| Cosmarium subtriordinatum var. subtriordinatum Schmidle | Cosmarium subtriordinatum var. subtriordinatum | 80701 |
| Cosmarium subtumidum Nordstedt | Cosmarium subtumidum | 80701 |
| Pleurotaeniopsis subturgida var. subturgida Schmidle | Pleurotaeniopsis subturgida var. subturgida | 80701 |
| Cosmarium subundulatum Wille | Cosmarium subundulatum | 80701 |
| Docidium subundulatum Borge | Docidium subundulatum | 80701 |
| Cosmarium succissum W. West | Cosmarium succissum | 80701 |
| Cosmarium succissum var. succissum Lütkem. | Cosmarium succissum var. succissum | 80701 |
| Xanthidium superbum Elfving | Xanthidium superbum | 80701 |
| Desmidium swartzii C. Agardh ex Ralfs | Desmidium swartzii | 80701 |
| Cosmarium synthlibomenum W. West | Cosmarium synthlibomenum | 80701 |
| Staurastrum tangaroae Thomasson | Staurastrum tangaroae | 80701 |
| Cosmarium tatricum Raciborski | Cosmarium tatricum | 80701 |
| Staurastrum tauphorum W. West & G.S. West | Staurastrum tauphorum | 80701 |
| Cosmarium taxichondriforme Eichler & Gutwinski | Cosmarium taxichondriforme | 80701 |
| Cosmarium taxichondrum P. Lundell | Cosmarium taxichondrum | 80701 |
| Cosmarium taxichondrum var. taxichondrum A.M. Scott & Prescott | Cosmarium taxichondrum var. taxichondrum | 80701 |
| Staurastrum teliferum Ralfs | Staurastrum teliferum | 80701 |
| Cosmarium tenue W. Archer | Cosmarium tenue | 80701 |
| Pleurotaenium tenue Schmidle | Pleurotaenium tenue | 80701 |
| Staurastrum tenuissimum W. West & G.S. West | Staurastrum tenuissimum | 80701 |
| Docidium tessellatum Joshua | Docidium tessellatum | 80701 |
| Xanthidium tetracentrotum Wolle | Xanthidium tetracentrotum | 80701 |
| Staurastrum tetracerum Ralfs | Staurastrum tetracerum | 80701 |
| Cosmarium tetrachondrum P. Lundell | Cosmarium tetrachondrum | 80701 |
| Spondylosium tetragonum W. West & G.S. West | Spondylosium tetragonum | 80701 |
| Cosmarium tetraophthalmum Brébisson | Cosmarium tetraophthalmum | 80701 |
| Staurastrum thienemannii Willi Krieger | Staurastrum thienemannii | 80701 |
| Cosmarium tholiforme Cohn | Cosmarium tholiforme | 80701 |
| Micrasterias thomasiana W. Archer | Micrasterias thomasiana | 80701 |
| Cosmarium thwaitesii Ralfs | Cosmarium thwaitesii | 80701 |
| Cosmarium thwaitesii var. thwaitesii Klebs | Cosmarium thwaitesii var. thwaitesii | 80701 |
| Staurastrum tiara Playfair | Staurastrum tiara | 80701 |
| Cosmarium tinctum Ralfs | Cosmarium tinctum | 80701 |
| Cosmarium tjibenongense Gutwinski | Cosmarium tjibenongense | 80701 |
| Staurastrum tohopekaligense Wolle | Staurastrum tohopekaligense | 80701 |
| Micrasterias torreyi Bailey ex Ralfs | Micrasterias torreyi | 80701 |
| Micrasterias torreyi var. torreyi Willi Krieger | Micrasterias torreyi var. torreyi | 80701 |
| Pleurotaenium trabecula var. trabecula Cedergr. | Pleurotaenium trabecula var. trabecula | 80701 |
| Cosmarium trachydermum W. West & G.S. West | Cosmarium trachydermum | 80701 |
| Staurastrum trachygonum W. West | Staurastrum trachygonum | 80701 |
| Cosmarium trachypleurum P. Lundell | Cosmarium trachypleurum | 80701 |
| Staurastrum trachytithophorum W. West & G.S. West | Staurastrum trachytithophorum | 80701 |
| Cosmarium trafalgaricum Wittrock & Wittrock | Cosmarium trafalgaricum | 80701 |
| Xanthidium triangulare Okada | Xanthidium triangulare | 80701 |
| Docidium tridentulum Wolle | Docidium tridentulum | 80701 |
| Staurastrum tridentulum Playfair | Staurastrum tridentulum | 80701 |
| Streptonema trilobatum G.C. Wallich | Streptonema trilobatum | 80701 |
| Cosmarium trilobulatum Reinsch | Cosmarium trilobulatum | 80701 |
| Cosmarium trilobulatum var. trilobulatum Printz | Cosmarium trilobulatum var. trilobulatum | 80701 |
| Cosmarium triplicatum Wolle | Cosmarium triplicatum | 80701 |
| Cosmarium triplicatum var. triplicatum Nordstedt | Cosmarium triplicatum var. triplicatum | 80701 |
| Staurastrum triprocessum A.M. Scott & Prescott | Staurastrum triprocessum | 80701 |
| Micrasterias tropica Nordstedt | Micrasterias tropica | 80701 |
| Cosmarium tuberculatum W. Archer | Cosmarium tuberculatum | 80701 |
| Cosmocladium tuberculatum Prescott & Prescott | Cosmocladium tuberculatum | 80701 |
| Cosmarium tumens Nordstedt | Cosmarium tumens | 80701 |
| Cosmarium tumidum P. Lundell | Cosmarium tumidum | 80701 |
| Staurastrum turgescens De Notaris | Staurastrum turgescens | 80701 |
| Pleurotaeniopsis turgida var. turgida Nordstedt | Pleurotaeniopsis turgida var. turgida | 80701 |
| Cosmarium turneri Roy | Cosmarium turneri | 80701 |
| Euastrum turneri W. West | Euastrum turneri | 80701 |
| Euastrum turneri var. turneri A.M. Scott & Prescott | Euastrum turneri var. turneri | 80701 |
| Cosmarium turpinii Brébisson | Cosmarium turpinii | 80701 |
| Staurastrum uhtuense Grönblad | Staurastrum uhtuense | 80701 |
| Cosmarium uliginosum Playfair | Cosmarium uliginosum | 80701 |
| Cosmarium umbilicatum Lütkem. | Cosmarium umbilicatum | 80701 |
| Onychonema uncinatum Wallich | Onychonema uncinatum | 80701 |
| Pleurotaeniopsis undatum A.M. Scott & Prescott | Pleurotaeniopsis undatum | 80701 |
| Pleurotaenium undatum A.M. Scott & Prescott | Pleurotaenium undatum | 80701 |
| Groenbladia undulata var. undulata Kurt Förster | Groenbladia undulata var. undulata | 80701 |
| Cosmarium undulatum Corda ex Ralfs | Cosmarium undulatum | 80701 |
| Docidium undulatum Bailey | Docidium undulatum | 80701 |
| Euastrum undulatum Playfair | Euastrum undulatum | 80701 |
| Staurastrum ungeri Reinsch | Staurastrum ungeri | 80701 |
| Cosmarium ungerianum var. ungerianum W. West & G.S. West | Cosmarium ungerianum var. ungerianum | 80701 |
| Staurastrum valdiviense var. valdiviense A. Couté & A. Iltis | Staurastrum valdiviense var. valdiviense | 80701 |
| Allorgeia valiae Gauthier-Lièvre | Allorgeia valiae | 80701 |
| Euastrum validum W. West & G.S. West | Euastrum validum | 80701 |
| Staurastrum varians var. varians W. Schmidle | Staurastrum varians var. varians | 80701 |
| Cosmarium variolatum P. Lundell | Cosmarium variolatum | 80701 |
| Cosmarium varsoviense var. varsoviense J. Rzicka | Cosmarium varsoviense var. varsoviense | 80701 |
| Euastrum ventricosum P. Lundell | Euastrum ventricosum | 80701 |
| Micrasterias verrucosa var. verrucosa Ruzicka | Micrasterias verrucosa var. verrucosa | 80701 |
| Euastrum verrucosum Ehrenberg ex Ralfs | Euastrum verrucosum | 80701 |
| Sphaerozosma vertebratum Brébisson ex Ralfs | Sphaerozosma vertebratum | 80701 |
| Staurastrum verticillatum W. Archer | Staurastrum verticillatum | 80701 |
| Triploceras verticillatum Bailey | Triploceras verticillatum | 80701 |
| Euastrum verucosum Ehrenberg | Euastrum verucosum | 80701 |
| Euastrum verucosum var. verucosum W.B. Turner | Euastrum verucosum var. verucosum | 80701 |
| Staurastrum vestitum Ralfs | Staurastrum vestitum | 80701 |
| Cosmarium vexatum W. West | Cosmarium vexatum | 80701 |
| Cosmarium vexatum var. vexatum Messik. | Cosmarium vexatum var. vexatum | 80701 |
| Cosmarium vicenistriatum Playfair | Cosmarium vicenistriatum | 80701 |
| Staurastrum victoriense G.S. West | Staurastrum victoriense | 80701 |
| Staurastrum victoriense var. victoriense Croasdale & Flint | Staurastrum victoriense var. victoriense | 80701 |
| Euastrum vinnulum A.M. Scott & Prescott | Euastrum vinnulum | 80701 |
| Echinella vitrea Bory | Echinella vitrea | 80701 |
| Cosmarium vogesiacum Lemmermann | Cosmarium vogesiacum | 80701 |
| Staurastrum volans West | Staurastrum volans | 80701 |
| Sphaerozosma wallichii var. wallichii W. West & G.S. West | Sphaerozosma wallichii var. wallichii | 80701 |
| Staurastrum wildemanii Gutwinski | Staurastrum wildemanii | 80701 |
| Staurastrum wildemanii var. wildemanii A.M. Scott & Prescott | Staurastrum wildemanii var. wildemanii | 80701 |
| Cosmarium willeanum Raciborski | Cosmarium willeanum | 80701 |
| Cosmarium wittrockii P. Lundell | Cosmarium wittrockii | 80701 |
| Cosmarium woodlawnense Playfair | Cosmarium woodlawnense | 80701 |
| Staurastrum xanthium Willi Krieger | Staurastrum xanthium | 80701 |
| Staurastrum yirrkallense A.M. Scott & Prescott | Staurastrum yirrkallense | 80701 |
| Staurastrum zahlbruckneri Lütkm. | Staurastrum zahlbruckneri | 80701 |
| Micrasterias zeylanica F.E. Fritsch | Micrasterias zeylanica | 80701 |
| Xanthidium zhejiangense Y.-X. Wei | Xanthidium zhejiangense | 80701 |
| Cosmarium zonatum P. Lundell | Cosmarium zonatum | 80701 |
| Staurastrum zonatum Borgesen | Staurastrum zonatum | 80701 |
| Cosmarium zonatum var. zonatum A.M. Scott & Grönblad | Cosmarium zonatum var. zonatum | 80701 |