27 Species in Family Ulvaceae
| Scientific Name | Author | English Name |
|---|---|---|
| Blidingia marginata | (J. Agardh) P.J.L. Dangeard ex Bliding | |
| Blidingia minima | (Nägeli ex Kützing) Kylin | Lesser grass-kelp |
| Blidingia ramifera | (Bliding) Garbary & Barkhouse | |
| Blidingia subsalsa | (Kjellman) Kornmann & Sahling ex Scagel et al. | |
| Percursaria percursa | (C. Agardh) Rosenvinge | |
| Ulva acanthophora | (Kützing) Hayden, Blomster, Maggs, P.C. Silva, Stanhope & J.R. Waaland | |
| Ulva californica | Wille | |
| Ulva chaetomorphoides | (Børgesen) Hayden, Blomster, Maggs, P.C. Silva, M.J. Stanhope & J.R. Waaland | |
| Ulva clathrata | (Roth) C. Agardh | Bright green nori |
| Ulva compressa | Linnaeus, 1753 | Tape weed |
| Ulva fasciata | Delile | |
| Ulva flexuosa | Wulfen | Winding nori |
| Ulva intestinalis | Linnaeus | Hollow green nori |
| Ulva intestinaloides | (Koeman & Hoek) Hayden, Blomster, Maggs, Silva, Stanhope & Waaland, 2003 | |
| Ulva kylinii | (Bliding) Hayden, Blomster, Maggs, P.C. Silva, M.J. Stanhope & J.R. Waaland | |
| Ulva lactuca | Linnaeus, 1753 | Sea lettuce |
| Ulva laetevirens | Areschoug | |
| Ulva linza | Linnaeus | Flat-tube sea lettuce |
| Ulva pertusa | Kjellman | |
| Ulva prolifera | O.F. Müller | Branched string lettuce |
| Ulva pseudolinza | (Koeman & Hoek) Hayden, Blomster, Maggs, Silva, Stanhope & Waaland, 2003 | |
| Ulva radiata | (J. Agardh) Hayden, Blomster, Maggs, P.C. Silva, M.J. Stanhope & J.R. Waaland | |
| Ulva ralfsii | (Harvey) Le Jolis | |
| Ulva reticulata | Forsskål | |
| Ulva rigida | C. Agardh | |
| Ulva simplex | (Vinogradova) Hayden, Blomster, Maggs, Silva, Stanhope & Waaland, 2003 | |
| Ulva torta | (Mertens) Trevisan |