• Arthrocladia villosa (Hudson) Duby, 1830: 1 to 3 months
• Atractophora hypnoides P.Crouan & H.Crouan, 1848: 1 to 3 months
• Choristocarpus tenellus Zanardini, 1860: 1 to 3 months
• Discosporangium mesarthrocarpum (Meneghini) Hauck, 1885: 1 to 3 months
• Discosporangium pulvillocarpum Kraft, 2009: 1 to 3 months
• Ulva acanthophora (Kützing) H.S.Hayden, Blomster, Maggs, P.C.Silva, Stanhope & Waaland, 2003: 1 to 3 months
• Ulva adhaerens Kaoru Matsumoto & S.Shimada, 2015: 1 to 3 months
• Ulva ambigua De Candolle, 1815: 1 to 3 months
• Ulva anandii Amjad & Shameel, 1993: 1 to 3 months
• Ulva aragoensis (Bliding) Maggs in Krupnik et al., 2018: 1 to 3 months
• Ulva arasakii Chihara, 1969: 1 to 3 months
• Ulva arbuscula Lagourgue & Payri, 2022: 1 to 3 months
• Ulva ardreana M.Cormaci, G.Furnari & G.Alongi, 2013: 1 to 3 months
• Ulva atroviridis Levring, 1938: 1 to 3 months
• Ulva aurantiaca Poiret, 1808: 1 to 3 months
• Ulva australis Areschoug, 1854: 1 to 3 months
• Ulva batuffolosa Lagourgue & Payri, 2022: 1 to 3 months
• Ulva beytensis Thivy & Sharma, 1966: 1 to 3 months
• Ulva biflagellata Bliding, 1944: 1 to 3 months
• Ulva binalis Hassall: 1 to 3 months
• Ulva blidingii Alongi, Cormaci & G.Furnari, 2014: 1 to 3 months
• Ulva brevistipita V.J.Chapman, 1956: 1 to 3 months
• Ulva brisbanensis L.G.Kraft, Kraft & R.F.Waller, 2010: 1 to 3 months
• Ulva bulbosa Pasilot de Beauvois, 1805: 1 to 3 months
• Ulva burmanica (Zeller) De Toni, 1889: 1 to 3 months
• Ulva byssoides Mertens: 1 to 3 months
• Ulva calendulifolia (S.G.Gmelin) J.F.Gmelin: 1 to 3 months
• Ulva californica Wille, 1899: 1 to 3 months
• Ulva caulescens J.V.Lamouroux: 1 to 3 months
• Ulva ceranoides W.Withering: 1 to 3 months
• Ulva chaetomorphoides (Børgesen) H.S.Hayden, Blomster, Maggs, P.C.Silva, Stanhope & Waaland, 2003: 1 to 3 months
• Ulva chaugulii M.G.Kavale & M.A.Kazi, 2016: 1 to 3 months
• Ulva cinerea Martens ex De Notaris: 1 to 3 months
• Ulva clathrata (Roth) C.Agardh, 1811: 1 to 3 months
• Ulva clathrus (Gmelin) Poiret: 1 to 3 months
• Ulva coccinea Hudson, 1778: 1 to 3 months
• Ulva compressa Linnaeus, 1753: 1 to 3 months
• Ulva confervoides Thuillier, 1813: 1 to 3 months
• Ulva conglobata Kjellman, 1897: 1 to 3 months
• Ulva cornea Poiret: 1 to 3 months
• Ulva cornuta Lightfoot, 1777: 1 to 3 months
• Ulva costata Wollny, 1881: 1 to 3 months
• Ulva covelongensis V.Krishnamurthy & H.Joshi, 1969: 1 to 3 months
• Ulva crassa V.J.Chapman, 1956: 1 to 3 months
• Ulva crassimembrana (V.J.Chapman) H.S.Hayden, Blomster, Maggs, P.C.Silva, Stanhope & Waaland, 2003: 1 to 3 months
• Ulva cribrosa (J.Agardh) Bornet: 1 to 3 months
• Ulva crispa P.J.L.Dangeard, 1959: 1 to 3 months
• Ulva croatica Alongi, Cormaci & Furnari, 2014: 1 to 3 months
• Ulva cruciata (Collins) A.C.Mathieson & Dawes, 2017: 1 to 3 months
• Ulva cuneata Forsskål, 1775: 1 to 3 months
• Ulva curvata (Kützing) De Toni, 1889: 1 to 3 months
• Ulva damaeformis Roth: 1 to 3 months
• Ulva dangeardii Gayral & Mazancourt, 1962: 1 to 3 months
• Ulva denticulata P.J.L.Dangeard, 1959: 1 to 3 months
• Ulva diaphana Hudson, 1778: 1 to 3 months
• Ulva diluviana Schlotheim: 1 to 3 months
• Ulva divisa Suhr: 1 to 3 months
• Ulva elegans Gayral, 1962: 1 to 3 months
• Ulva enteromorpha Le Jolis, 1863: 1 to 3 months
• Ulva erecta (Lyngbye) Fries: 1 to 3 months
• Ulva expansa (Setchell) Setchell & N.L.Gardner, 1920: 1 to 3 months
• Ulva fasciculata A.P.de Candolle: 1 to 3 months
• Ulva fenestrata Postels & Ruprecht, 1840: 1 to 3 months
• Ulva fetida (D.Villars) J.P.E.Vaucher: 1 to 3 months
• Ulva finissima Lagourgue & Payri, 2022: 1 to 3 months
• Ulva flabelliformis Roth: 1 to 3 months
• Ulva flabelliformis Wulfen: 1 to 3 months
• Ulva flavescens Hudson, 1778: 1 to 3 months
• Ulva flexuosa Wulfen, 1803: 1 to 3 months
• Ulva foliacea Poiret: 1 to 3 months
• Ulva fungosa (Desfontaines) Poiret: 1 to 3 months
• Ulva gayralii Cauro: 1 to 3 months
• Ulva gelatinosa Kützing, 1856: 1 to 3 months
• Ulva geminoidea V.J.Chapman, 1956: 1 to 3 months
• Ulva gigantea (Kützing) Bliding, 1969: 1 to 3 months
• Ulva gracillima (G.S.West) Škaloud & Leliaert, 2018: 1 to 3 months
• Ulva grandis Saifullah & Nizamuddin, 1977: 1 to 3 months
• Ulva hookeriana (Kützing) H.S.Hayden, Blomster, Maggs, P.C.Silva, Stanhope & Waaland, 2003: 1 to 3 months
• Ulva hopkirkii (M'Calla ex Harvey) P.Crouan & H.Crouan: 1 to 3 months
• Ulva howensis (A.H.S.Lucas) Kraft, 2007: 1 to 3 months
• Ulva iliohaha H.L.Spalding & A.R.Sherwood, 2016: 1 to 3 months
• Ulva incurvata Parriaud, 1959: 1 to 3 months
• Ulva indica Roth, 1806: 1 to 3 months
• Ulva infundibuliformis Turra, 1780: 1 to 3 months
• Ulva intestinalis Linnaeus, 1753: 1 to 3 months
• Ulva intestinaloides (Koeman & Hoek) H.S.Hayden, Blomster, Maggs, P.C.Silva, Stanhope & Waaland, 2003: 1 to 3 months
• Ulva intricata Thuillier, 1836: 1 to 3 months
• Ulva involvens Savi: 1 to 3 months
• Ulva javanica N.L.Burman, 1768: 1 to 3 months
• Ulva kanagawae V.Carneiro, N.T.Martins & Cassano, 2023: 1 to 3 months
• Ulva kylinii (Bliding) H.S.Hayden, Blomster, Maggs, P.C.Silva, Stanhope & Waaland, 2003: 1 to 3 months
• Ulva lactuca Linnaeus, 1753: 1 to 3 months
• Ulva lactucifolia S.F.Gray: 1 to 3 months
• Ulva laingii V.J.Chapman, 1956: 1 to 3 months
• Ulva lapathifolia (Kützing) De Toni: 1 to 3 months
• Ulva leptophylla Arasaki: 1 to 3 months
• Ulva limnetica K.Ichihara & S.Shimada, 2009: 1 to 3 months
• Ulva linearis P.J.L.Dangeard, 1957: 1 to 3 months
• Ulva linza Linnaeus, 1753: 1 to 3 months
• Ulva linzoides Alongi, Cormaci & G.Furnari, 2014: 1 to 3 months