found: Work cat.: Hayden, H.S. Systematics of Ulvaceae (Ulvales, Ulvophyceae) and the genus Ulva L. based on nuclear and chloroplast sequence data, 2001:p. 1 (Ulva (sea lettuce)) p. 2 (approx. 50 recognized species; common nearshore algal genus)
found: ITIS, July 19, 2002(Ulva Linnaeus, 1753. Family Ulvaceae)
found: European register of marine species, via WWW, July 19, 2002(14 species of Ulva listed under family Ulvaceae)
found: AlgaeBase, via WWW, July 19, 2002(Genus Ulva, family Ulvaceae; 59 species)