Acanthophora J.V.Lamouroux, 1813 (additional source)
Acanthophora nayadiformis (Delile) Papenfuss, 1968 (additional source)
Acanthophora spicifera (M.Vahl) Børgesen, 1910 (basis of record)
Acetabularia subg. Acicularia caliculus J.V. Lamouroux, 1824 represented as Acetabularia caliculus J.V.Lamouroux, 1824 (additional source)
Acrochaetium Nägeli, 1858 (additional source)
Acrochaetium codicola Børgesen, 1927 accepted as Colaconema codicola (Børgesen) Stegenga, J.J.Bolton & R.J.Anderson, 1997 (basis of record)
Acrochaetium moniliforme (Rosenvinge) Børgesen, 1915 (additional source)
Acrochaetium savianum (Meneghini) Nägeli, 1862 accepted as Colaconema savianum (Meneghini) R.Nielsen, 1994 (additional source)
Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (additional source)
Acrochaetium subseriatum Børgesen, 1932 (additional source)
Acrosorium Zanardini ex Kützing, 1869 (additional source)
Acrosorium venulosum (Zanardini) Kylin, 1924 (additional source)
Acrothamnion J.Agardh, 1892 (additional source)
Acrothamnion preissii (Sonder) E.M.Wollaston, 1968 (additional source)
Agardhiella F.Schmitz, 1897 (additional source)
Agardhiella subulata (C.Agardh) Kraft & M.J.Wynne, 1979 (additional source)
Aglaothamnion Feldmann-Mazoyer, 1941 (additional source)
Ahnfeltiopsis P.C.Silva & DeCew, 1992 (additional source)
Ahnfeltiopsis furcellata (C.Agardh) P.C.Silva & DeCew, 1992 accepted as Asterfilopsis furcellata (C.Agardh) M.S.Calderon & S.M.Boo, 2016 (basis of record)
Amphiroa J.V.Lamouroux, 1812 (additional source)
Amphiroa rigida J.V.Lamouroux, 1816 (additional source)
Anadyomene J.V.Lamouroux, 1812 (additional source)
Anotrichium Nägeli, 1862 (additional source)
Anotrichium furcellatum (J.Agardh) Baldock, 1976 (additional source)
Antithamnion Nägeli, 1847 (additional source)
Antithamnion diminuatum Wollaston, 1968 (additional source)
Antithamnion hubbsii E.Y.Dawson, 1962 (basis of record)
Apoglossum J.Agardh, 1898 (additional source)
Apoglossum gregarium (E.Y.Dawson) M.J.Wynne, 1985 accepted as Phrix spatulata (E.Y.Dawson) M.J.Wynne, M.Kamiya & J.A.West, 2018 (additional source)
Asparagopsis Montagne, 1840 (additional source)
Asparagopsis armata Harvey, 1855 (additional source)
Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, 1845 (additional source)
Avrainvillea amadelpha (Montagne) A.Gepp & E.S.Gepp, 1908 (basis of record)
Bangia Lyngbye, 1819 (additional source)
Bangia atropurpurea (Mertens ex Roth) C.Agardh, 1824 (additional source)
Blidingia Kylin, 1947 (additional source)
Blidingia marginata (J.Agardh) P.J.L.Dangeard ex Bliding, 1963 (additional source)
Blidingia minima (Nägeli ex Kützing) Kylin, 1947 (additional source)
Botryocladia madagascariensis G.Feldmann, 1945 (additional source)
Bryopsis pennata J.V.Lamouroux, 1809 (additional source)
Callithamnion Lyngbye, 1819 (additional source)
Carradoriella P.C.Silva, 1996 (basis of record)
Caulacanthus Kützing, 1843 (additional source)
Caulacanthus ustulatus (Turner) Kützing, 1843 (additional source)
Caulerpa J.V.Lamouroux, 1809 (additional source)
Caulerpa brachypus Harvey, 1860 (basis of record)
Caulerpa filiformis (Suhr) Hering, 1841 (basis of record)
Caulerpa mexicana Sonder ex Kützing, 1849 (additional source)
Caulerpa racemosa (Forsskål) J.Agardh, 1873 (additional source)
Caulerpa scalpelliformis (R.Brown ex Turner) C.Agardh, 1817 (additional source)
Caulerpa sertularioides (S.G.Gmelin) M.Howe, 1905 (additional source)
Caulerpa taxifolia (M.Vahl) C.Agardh, 1817 (additional source)
Caulerpa verticillata J.Agardh, 1847 (basis of record)
Caulerpa webbiana Montagne, 1837 (additional source)
Ceramium Roth, 1797 (additional source)
Ceramium codii (H.Richards) Mazoyer, 1938 accepted as Stirkia codii (H.Richards) Barros-Barreto & Maggs, 2023 (additional source)
Ceramium flaccidum (Harvey ex Kützing) Ardissone, 1871 accepted as Gayliella flaccida (Harvey ex Kützing) T.O.Cho & L.J.McIvor, 2008 (additional source)
Chaetomorpha Kützing, 1845 (additional source)
Champia Desvaux, 1809 (additional source)
Champia parvula (C.Agardh) Harvey, 1853 (additional source)
Chondracanthus Kützing, 1843 (additional source)
Chondracanthus teedei (Mertens ex Roth) Kützing, 1843 (additional source)
Chondria C.Agardh, 1817 (additional source)
Chondria capillaris (Hudson) M.J.Wynne, 1991 (additional source)
Chondria collinsiana M.A.Howe, 1920 (additional source)
Chroodactylon Hansgirg, 1885 (additional source)
Chroodactylon ornatum (C.Agardh) Basson, 1979 (additional source)
Chrysymenia J.Agardh, 1842 (additional source)
Cladophora Kützing, 1843 (additional source)
Cladophora coelothrix Kützing, 1843 (additional source)
Cladophora hutchinsiae (Dillwyn) Kützing, 1845 (additional source)
Cladophora laetevirens (Dillwyn) Kützing, 1843 (additional source)
Cladophora patentiramea (Montagne) Kützing, 1849 (basis of record)
Cladophora prolifera (Roth) Kützing, 1843 (additional source)
Cladophora sericea (Hudson) Kützing, 1843 (additional source)
Cladophora vagabunda (Linnaeus) Hoek, 1963 (additional source)
Cladophoropsis Børgesen, 1905 (additional source)
Cladophoropsis javanica (Kützing) P.C.Silva, 1996 accepted as Acrocladus herpesticus (Montagne) Boedeker, 2016 accepted as Lychaete herpestica (Montagne) M.J.Wynne, 2017 (basis of record)
Cladosiphon Kützing, 1843 (additional source)
Codium Stackhouse, 1797 (additional source)
Codium arabicum Kützing, 1856 (basis of record)
Codium taylorii P.C.Silva, 1960 (additional source)
Colpomenia (Endlicher) Derbès & Solier, 1851 (additional source)
Colpomenia sinuosa (Mertens ex Roth) Derbès & Solier, 1851 (additional source)
Corallina Linnaeus, 1758 (additional source)
Cryptonemia J.Agardh, 1842 (additional source)
Cutleria Greville, 1830 (additional source)
Cystoseira C.Agardh, 1820 (additional source)
Dasya C.Agardh, 1824 (additional source)
Dasya baillouviana (S.G.Gmelin) Montagne, 1841 accepted as Dasya pedicellata (C.Agardh) C.Agardh, 1824 (additional source)
Derbesia Solier, 1846 (additional source)
Desmarestia J.V.Lamouroux, 1813 (additional source)
Dictyosphaeria Decaisne, 1842 (additional source)
Dictyosphaeria cavernosa (Forsskål) Børgesen, 1932 (basis of record)
Dictyota ciliolata Sonder ex Kützing, 1859 (additional source)
Dictyota dichotoma (Hudson) J.V.Lamouroux, 1809 (additional source)
Dictyota fasciola (Roth) J.V.Lamouroux, 1809 (additional source)
Dipterosiphonia F.Schmitz & Falkenberg, 1897 (additional source)
Dipterosiphonia dendritica (C.Agardh) F.Schmitz, 1897 (additional source)
Ectocarpus Lyngbye, 1819 (additional source)