Abacella Maslov, 1956 † (basis of record)
Abacella cornuta Shuysky, 1973 † (basis of record)
Abacella delicatula J.H.Johnson, 1964 † (basis of record)
Abacella dentata Shuysky, 1973 † (basis of record)
Abacella pertusa Maslov, 1956 † (basis of record)
Abacella pustulata Shuysky, 1973 † (basis of record)
Abacella stellata Shuysky, 1991 † (basis of record)
Abbottella Hollenberg, 1967 (basis of record)
Abbottella concinna Hollenberg, 1967 (basis of record)
Abedinium Loeblich & A.R.Loeblich, 1966 (additional source)
Abedinium dasypus (Cachon & Cachon-Enjumet) Loeblich Jr & Loeblich III, 1966 (additional source)
Abollifer Vørs, 1992 (additional source)
Abollifer prolabens Vørs, 1992 (additional source)
Abratopdinium S.Mao & B.A.R.Mohr, 1992 (basis of record)
Abratopdinium cardioforme S.Mao & B.A.R.Mohr † (basis of record)
Abratopdinium kerguelense S.Mao & B.A.R.Mohr † (basis of record)
Abroteia Harvey ex J.Agardh, 1876 (basis of record)
Abroteia suborbicularis (Harvey) J.Agardh, 1878 (basis of record)
Abruptophycus Vologdin, 1962 † (basis of record)
Abruptophycus colonialis Vologdin, 1962 † (basis of record)
Abruptophycus compositus Vologdin, 1962 † (basis of record)
Acaciella M.R.Walter, 1972 † (basis of record)
Acaciella augusta W.V.Preiss, 1972 † (basis of record)
Acaciella australica (Howchin) M.R.Walter, 1972 † (basis of record)
Acanthina Korde, 1973 † (basis of record)
Acanthina bullosa Korde, 1973 † (basis of record)
Acanthina multiformis Korde, 1973 † (basis of record)
Acanthochloris Pascher, 1930 (basis of record)
Acanthochloris bacillifera Pascher, 1938 (basis of record)
Acanthochloris brevispinosa Pascher, 1930 (basis of record)
Acanthochloris brevispinosa var. brevispinosa Péterfi & Péterfi, 1966 (basis of record)
Acanthochloris ingens Margalef, 1956 (basis of record)
Acanthochloris scherffelii Pascher, 1938 (basis of record)
Acanthochloris verrucosa Ettl, 1977 (basis of record)
Acanthocladia Ardissone, 1886 (basis of record)
Acanthococcus J.D.Hooker & Harvey, 1845 (additional source)
Acanthococcus Lagerheim, 1883 accepted as Glochiococcus G.B.De Toni, 1888 (basis of record)
Acanthococcus anglicus A.W.Bennett, 1888 accepted as Glochiococcus anglicus (A.W.Bennett) De Toni, 1888 (basis of record)
Acanthococcus antarcticus Hooker f. & Harvey, 1845 (basis of record)
Acanthococcus antarcticus Hooker f. & Harvey, 1845 (additional source)
Acanthococcus sporoides Reinsch (basis of record)
Acanthocorbis apoda (Leadbeater) Hara & Takahashi, 1984 (additional source)
Acanthocorbis asymmetrica (Thomsen) Hara & Takahashi, 1984 (additional source)
Acanthocorbis camarensis Hara et al., 1996 (basis of record)
Acanthocorbis campanula (Espeland) Thomsen, 1991 (additional source)
Acanthocorbis haurakiana Thomsen, 1991 (additional source)
Acanthocorbis nana Thomsen, Garrison & Kosman, 1991 (basis of record)
Acanthocorbis prolongata Thomsen, Garrison & Kosman, 1997 (basis of record)
Acanthocorbis tinnabulum Marchant et al., 1987 (basis of record)
Acanthocorbis unguiculata (Thomsen) Hara & Takahashi, 1984 (additional source)
Acanthocorbis weddellensis Thomsen, Garrison & Kosman, 1997 (additional source)
Acanthodinium Kofoid, 1907 (basis of record)
Acanthodinium caryophyllum Kofoid, 1907 (basis of record)
Acanthogonyaulax spinifera (Murray & Whitting) H.W.Graham, 1942 (additional source)
Acanthoica acanthifera Lohmann ex Lohmann, 1913 (additional source)
Acanthoica acanthos J.Schiller, 1925 (basis of record)
Acanthoica bidentula Lecal-Schlauder, 1951 (basis of record)
Acanthoica biscayensis A.Kleijne, 1992 (basis of record)
Acanthoica brevispina J.Schiller, 1913 accepted as Acanthoica quattrospina var. brevispina (Schiller) Schiller (basis of record)
Acanthoica coronata Lohmann, 1903 (additional source)
Acanthoica janchenii J.Schiller, 1925 (basis of record)
Acanthoica lithostratos J.Schiller, 1926 (basis of record)
Acanthoica lithostratos J.Schiller, 1926 (source of synonymy)
Acanthoica maxima Heimdal, 1981 (additional source)
Acanthoica monospina J.Schiller, 1925 (basis of record)
Acanthoica ornata Conrad, 1928 (basis of record)
Acanthoica quattrospina Lohmann, 1903 (additional source)
Acanthoica quattrospina var. brevispina (Schiller) Schiller (basis of record)
Acanthoica rubens Kamptner, 1941 (basis of record)
Acanthoica schilleri Conrad, 1928 (basis of record)
Acanthoica trispinosa Ostenfeld (basis of record)
Acanthopeltis Okamura, 1892 (basis of record)
Acanthophora J.V.Lamouroux, 1813 (additional source)
Acanthophora aokii Okamura, 1934 (basis of record)
Acanthophora dendroides Harvey, 1855 (additional source)
Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828 (basis of record)
Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828 (additional source)
Acanthophora muscoides var. turneri (C.Agardh) Trevisan (basis of record)
Acanthophora nayadiformis (Delile) Papenfuss, 1968 (basis of record)
Acanthophora pacifica (Setchell) Kraft, 1979 (basis of record)
Acanthophora ramulosa Lindenberg ex Kützing, 1843 (basis of record)
Acanthophora spicifera (M.Vahl) Børgesen, 1910 (additional source)
Acanthosiphonia A.M.Savoie & G.W.Saunders, 2019 (basis of record)
Acanthosiphonia echinata (Harvey) Savoie & G.W.Saunders, 2018 (basis of record)
Acanthosolenia F.Bernard, 1939 (basis of record)
Acanthosolenia mediterranea F.C.Bernard, 1939 (basis of record)
Acanthosphaera Lemmermann, 1899 (basis of record)
Acanthosphaera zachariasii Lemmermann, 1899 (basis of record)
Acanthosphaeridium Hajós & Stradner (basis of record)
Acanthosphaeridium reticulatum M.Hajós & H.Stradner, 1975 † (basis of record)
Acarposporophycos O.Necchi, 2019 (basis of record)
Acarposporophycos brasiliensis (Necchi) Necchi & A.S.García, 2019 (basis of record)
Acaryochloridaceae J.Komárek, J.Kastovsky, Mareš & J.R.Johansen, 2014 (basis of record)
Acaryochloridales (basis of record)
Acaryochloris marina H.Miyashita & Chihara, 2003 (basis of record)
Acaryochloris marina H.Miyashita & Chihara, 2003 (additional source)
Acaryochloris thomasi Partensky & al., 2018 (basis of record)
Acetabularia J.V.Lamouroux, 1812 (additional source)
Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952 (basis of record)
Acetabularia caliculus J.V.Lamouroux, 1824 (basis of record)

English ant-like flower beetles for Anthicidae Latreille, 1819
English black siphon weed [from synonym] for Polysiphonia fucoides (Hudson) Greville, 1824
English bushy berry wrack [from synonym] for Cystoseira baccata (S.G.Gmelin, 1768) P.C.Silva, 1952
Swedish fjäderslick [from synonym] for Polysiphonia fucoides (Hudson) Greville, 1824