Acrochaete leptochaete (Huber) R.Nielsen, 1983 accepted as Ulvella leptochaete (Huber) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (additional source)
Acrochaete repens Pringsheim, 1862 accepted as Ulvella repens (Pringsheim) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (additional source)
Acrochaete viridis (Reinke) R.Nielsen, 1979 accepted as Ulvella viridis (Reinke) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (additional source)
Acrochaete wittrockii (Wille) R.Nielsen, 1983 accepted as Ulvella wittrockii (Wille) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (additional source)
Acrothrix gracilis Kylin, 1907 (additional source)
Agarum clathratum Dumortier, 1822 (additional source)
Ahnfeltia plicata (Hudson) E.M.Fries, 1836 (additional source)
Alaria esculenta (Linnaeus) Greville, 1830 (additional source)
Antithamnion cruciatum (C.Agardh) Nägeli, 1847 (additional source)
Antithamnionella floccosa (O.F.Müller) Whittick, 1980 (additional source)
Asperococcus fistulosus (Hudson) W.J.Hooker, 1833 (additional source)
Audouinella alariae (Jónsson) Woelkerling, 1973 accepted as Acrochaetium alariae (Jónsson) Bornet, 1904 (additional source)
Audouinella daviesii (Dillwyn) Woelkerling, 1971 accepted as Colaconema daviesii (Dillwyn) Stegenga, 1985 (additional source)
Audouinella membranacea (Magnus) Papenfuss, 1945 accepted as Rubrointrusa membranacea (Magnus) S.L.Clayden & G.W.Saunders, 2010 (additional source)
Audouinella purpurea (Lightfoot) Woelkerling, 1973 accepted as Rhodochorton purpureum (Lightfoot) Rosenvinge, 1900 (additional source)
Audouinella saviana (Meneghini) Woelkerling, 1973 accepted as Colaconema savianum (Meneghini) R.Nielsen, 1994 (additional source)
Audouinella secundata (Lyngbye) P.S.Dixon, 1976 accepted as Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (additional source)
Bangia fuscopurpurea (Dillwyn) Lyngbye, 1819 (additional source)
Blastophysa rhizopus Reinke, 1889 (additional source)
Blidingia marginata (J.Agardh) P.J.L.Dangeard ex Bliding, 1963 (additional source)
Blidingia minima (Nägeli ex Kützing) Kylin, 1947 (additional source)
Bolbocoleon piliferum Pringsheim, 1862 (additional source)
Bonnemaisonia hamifera Hariot, 1891 (additional source)
Botrytella micromora Bory, 1822 (additional source)
Bryopsis hypnoides J.V.Lamouroux, 1809 (additional source)
Bryopsis plumosa (Hudson) C.Agardh, 1823 (additional source)
Callithamnion corymbosum (Smith) Lyngbye, 1819 (additional source)
Callithamnion tetragonum (Stackhouse) S.F.Gray, 1821 (additional source)
Callophyllis cristata (C.Agardh) Kützing, 1849 accepted as Euthora cristata (C.Agardh) J.Agardh, 1847 (additional source)
Capsosiphon fulvescens (C.Agardh) Setchell & N.L.Gardner, 1920 (additional source)
Capsosiphon groenlandicus (J.Agardh) K.L.Vinogradova, 1974 accepted as Pseudothrix groenlandica (J.Agardh) Hanic & S.C.Lindstrom, 2008 (additional source)
Ceramium deslongchampsii Chauvin ex Duby, 1830 (additional source)
Ceramium diaphanum (Lightfoot) Roth, 1806 (additional source)
Ceramium elegans (Roth) Ducluzeau, 1805 accepted as Ceramium siliquosum var. elegans (Roth) G.Furnari, 1999 (additional source)
Ceramium rubrum C.Agardh, 1811 accepted as Ceramium virgatum Roth, 1797 (additional source)
Ceramium strictum (Kützing) Rabenhorst, 1847 accepted as Ceramium deslongchampsii Chauvin ex Duby, 1830 (additional source)
Ceratocolax hartzii Rosenvinge, 1898 accepted as Coccotylus hartzii (Rosenvinge) Le Gall & G.W.Saunders, 2010 (additional source)
Chaetomorpha aerea (Dillwyn) Kützing, 1849 (additional source)
Chaetomorpha brachygona Harvey, 1858 (additional source)
Chaetomorpha capillaris (Kützing) Børgesen, 1925 (additional source)
Chaetomorpha linum (O.F.Müller) Kützing, 1845 (additional source)
Chaetomorpha melagonium (F.Weber & D.Mohr) Kützing, 1845 (additional source)
Chaetomorpha picquotiana Montagne ex Kützing, 1849 (additional source)
Chilionema reptans (P.L.Crouan & H.M.Crouan) Sauvageau, 1897 accepted as Asperococcus fistulosus (Hudson) W.J.Hooker, 1833 (additional source)
Chlorhormidium catenatum G.R.South & Tittley, 1986 (original description)
Chondria dasyphylla (Woodward) C.Agardh, 1817 (additional source)
Chondrus crispus Stackhouse, 1797 (additional source)
Chorda filum (Linnaeus) Stackhouse, 1797 (additional source)
Chorda tomentosa Lyngbye, 1819 accepted as Halosiphon tomentosus (Lyngbye) Jaasund, 1957 (additional source)
Chordaria flagelliformis (O.F.Müller) C.Agardh, 1817 (additional source)
Choreocolax polysiphoniae Reinsch, 1875 (additional source)
Cladophora albida (Nees) Kutzing, 1843 (additional source)
Cladophora pygmaea Reinke, 1888 accepted as Lychaete pygmaea (Reinke) M.J.Wynne, 2017 (additional source)
Cladophora refracta Kützing, 1843 (basis of record)
Cladophora ruchingeri (C.Agardh) Kützing, 1845 (additional source)
Cladophora rupestris (Linnaeus) Kützing, 1843 (additional source)
Cladophora sericea (Hudson) Kützing, 1843 (additional source)
Cladophora vagabunda (Linnaeus) Hoek, 1963 (additional source)
Cladosiphon zosterae (J.Agardh) Kylin, 1940 (additional source)
Clathromorphum circumscriptum (Strömfelt) Foslie, 1898 (additional source)
Clathromorphum compactum (Kjellman) Foslie, 1898 (additional source)
Codium fragile subsp. tomentosoides (van Goor) P.C.Silva, 1955 accepted as Codium fragile subsp. fragile (Suringar) Hariot, 1889 (additional source)
Coilodesme bulligera Strömfelt, 1886 (additional source)
Colpomenia peregrina Sauvageau, 1927 (additional source)
Corallina officinalis Linnaeus, 1758 (additional source)
Cruoriopsis ensis Jao, 1936 accepted as Cruoriopsis ensisae C.-C.Jao, 1936 (basis of record)
Cystoclonium purpureum (Hudson) Batters, 1902 (additional source)
Dasya baillouviana (S.G.Gmelin) Montagne, 1841 accepted as Dasya pedicellata (C.Agardh) C.Agardh, 1824 (additional source)
Delamarea attenuata (Kjellman) Rosenvinge, 1893 (additional source)
Derbesia marina (Lyngbye) Solier, 1846 (additional source)
Dermatocelis laminariae Rosenvinge, 1898 (additional source)
Dermatolithon pustulatum (J.V.Lamouroux) Foslie, 1898 accepted as Titanoderma pustulatum (J.V.Lamouroux) Nägeli, 1858 (additional source)
Desmarestia aculeata (Linnaeus) J.V.Lamouroux, 1813 (additional source)
Desmarestia viridis (O.F.Müller) J.V.Lamouroux, 1813 (additional source)
Devaleraea ramentacea (Linnaeus) Guiry, 1982 (additional source)
Dictyosiphon chordaria Areschoug, 1847 (additional source)
Dictyosiphon ekmanii Areschoug, 1875 (additional source)
Dictyosiphon foeniculaceus (Hudson) Greville, 1830 (additional source)
Dictyosiphon macounii Farlow, 1889 (additional source)
Diplochaete solitaria F.S.Collins, 1901 accepted as Mastogloia binotata (Grunow) Cleve, 1895 (basis of record)
Ectocarpus fasciculatus Harvey, 1841 (additional source)
Ectocarpus siliculosus (Dillwyn) Lyngbye, 1819 (additional source)
Ectochaete taylori Thivy accepted as Acrochaete taylorii (Thivy) O'Kelly, 2006 accepted as Ulvella taylorii (Thivy) R.Nielsen, C.J.O'Kelly & B.Wysor, 2013 (basis of record)
Elachista chondrii Areschoug, 1875 (additional source)
Endodictyon infestans Gran, 1897 (basis of record)
Enteromorpha ahlneriana Bliding, 1944 accepted as Ulva linza Linnaeus, 1753 (basis of record)
Enteromorpha clathrata (Roth) Greville, 1830 accepted as Ulva clathrata (Roth) C.Agardh, 1811 (additional source)
Enteromorpha flexuosa (Wulfen) J.Agardh, 1883 accepted as Ulva flexuosa Wulfen, 1803 (additional source)
Enteromorpha intestinalis (Linnaeus) Nees, 1820 accepted as Ulva intestinalis Linnaeus, 1753 (additional source)
Enteromorpha linza (Linnaeus) J.Agardh, 1883 accepted as Ulva linza Linnaeus, 1753 (additional source)
Enteromorpha pilifera Kützing, 1856 accepted as Ulva flexuosa subsp. pilifera (Kützing) M.J.Wynne, 2005 (basis of record)
Enteromorpha prolifera (O.F.Müller) J.Agardh, 1883 accepted as Ulva prolifera O.F.Müller, 1778 (additional source)
Enteromorpha radiata J.Agardh, 1883 accepted as Ulva radiata (J.Agardh) H.S.Hayden, Blomster, Maggs, P.C.Silva, Stanhope & Waaland, 2003 (additional source)
Enteromorpha stipitata P.J.L.Dangeard, 1959 (additional source)
Enteromorpha torta (Mertens) Reinbold, 1893 accepted as Ulva torta (Mertens) Trevisan, 1842 (additional source)
Epicladia flustrae Reinke, 1889 (additional source)
Epicladia perforans (Huber) R.Nielsen, 1980 (additional source)
Erythrotrichia carnea (Dillwyn) J.Agardh, 1883 (additional source)
Eudesme virescens (Carmichael ex Berkeley) J.Agardh, 1882 (additional source)
Fimbrifolium dichotomum (Lepechin) G.I.Hansen, 1980 (additional source)