Acanthoica quattrospina Lohmann, 1903 (additional source)
Acinetospora Bornet, 1891 (additional source)
Acinetospora crinita (Carmichael) Sauvageau, 1899 (additional source)
Acinetosporaceae Hamel ex J. Feldmann, 1937 (basis of record)
Acrochaete N.Pringsheim, 1862 accepted as Ulvella P.L.Crouan & H.M.Crouan, 1859 (additional source)
Acrochaete flustrae (Reinke) O'Kelly, 2006 accepted as Epicladia flustrae Reinke, 1889 (basis of record)
Acrochaete geniculata (N.L.Gardner) O'Kelly, 1983 accepted as Ulvella geniculata (N.L.Gardner) R.Nielsen, C.J.O'Kelly & B. Wysor, 2013 (additional source)
Acrochaete geniculata (N.L.Gardner) O'Kelly, 1983 accepted as Ulvella geniculata (N.L.Gardner) R.Nielsen, C.J.O'Kelly & B. Wysor, 2013 (basis of record)
Acrochaete inflata (Ercegovic) Gallardo, Gómez Garreta, M.A.Ribera, Cormaci, G.Furnari, Giaccone & Boudouresque, 1993 accepted as Ulvella inflata (Ercegovic) R.Nielsen, C.J.O'Kelly & B. Wysor, 2013 (additional source)
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)
Acrochaetium Nägeli, 1858 (additional source)
Acrochaetium alariae (Jónsson) Bornet, 1904 (additional source)
Acrochaetium attenuatum (Rosenvinge) Hamel, 1927 accepted as Colaconema attenuatum (Rosenvinge) R.Nielsen, 1994 accepted as Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914 (basis of record)
Acrochaetium battersianum Hamel, 1927 (additional source)
Acrochaetium battersianum Hamel, 1927 (basis of record)
Acrochaetium brebneri (Batters) Hamel, 1928 (basis of record)
Acrochaetium brebneri (Batters) Hamel, 1928 (additional source)
Acrochaetium catenulatum M.Howe, 1914 (basis of record)
Acrochaetium catenulatum M.Howe, 1914 (additional source)
Acrochaetium codii Hamel, 1927 accepted as Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton, 1991 (additional source)
Acrochaetium codii Hamel, 1927 accepted as Colaconema caespitosum (J.Agardh) Jackelman, Stegenga & J.J.Bolton, 1991 (basis of record)
Acrochaetium corymbiferum (Thuret) Batters, 1902 accepted as Colaconema corymbiferum (Thuret) Alongi, Cormaci & G.Furnari, 2017 (basis of record)
Acrochaetium corymbiferum (Thuret) Batters, 1902 accepted as Colaconema corymbiferum (Thuret) Alongi, Cormaci & G.Furnari, 2017 (additional source)
Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914 (basis of record)
Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914 (additional source)
Acrochaetium endozoicum (Darbishire) Batters, 1902 (additional source)
Acrochaetium gynandrum (Rosenvinge) Hamel, 1927 accepted as Colaconema gynandrum (Rosenvinge) R.Nielsen, 1994 (additional source)
Acrochaetium gynandrum (Rosenvinge) Hamel, 1927 accepted as Colaconema gynandrum (Rosenvinge) R.Nielsen, 1994 (basis of record)
Acrochaetium hallandicum (Kylin) Hamel, 1927 accepted as Colaconema hallandicum (Kylin) Afonso-Carillo, Sanson, Sangil & Diaz-Villa, 2007 (additional source)
Acrochaetium hallandicum (Kylin) Hamel, 1927 accepted as Colaconema hallandicum (Kylin) Afonso-Carillo, Sanson, Sangil & Diaz-Villa, 2007 (basis of record)
Acrochaetium humile (Rosenvinge) Børgesen, 1915 (additional source)
Acrochaetium immersum (Rosenvinge) Hamel, 1927 (additional source)
Acrochaetium immersum (Rosenvinge) Hamel, 1927 (basis of record)
Acrochaetium infestans M.Howe & Hoyt, 1916 accepted as Colaconema infestans (M.Howe & Hoyt) Woelkerling, 1973 (additional source)
Acrochaetium infestans M.Howe & Hoyt, 1916 accepted as Colaconema infestans (M.Howe & Hoyt) Woelkerling, 1973 (basis of record)
Acrochaetium irregulare (Reinsch) (basis of record)
Acrochaetium kuckuckianum Hamel, 1927 (basis of record)
Acrochaetium lanuginosum (Dillwyn) Nägeli, 1858 accepted as Colaconema daviesii (Dillwyn) Stegenga, 1985 (basis of record)
Acrochaetium leptonema (Rosenvinge) Børgesen, 1915 accepted as Colaconema leptonema (Rosenvinge) Alongi, Cormaci & G.Furnari, 2017 (additional source)
Acrochaetium leptonema (Rosenvinge) Børgesen, 1915 accepted as Colaconema leptonema (Rosenvinge) Alongi, Cormaci & G.Furnari, 2017 (basis of record)
Acrochaetium lorrain-smithiae (Lyle) L.Newton, 1931 (additional source)
Acrochaetium maluinum Hamel, 1927 (basis of record)
Acrochaetium microfilum C.-C.Jao, 1936 (additional source)
Acrochaetium microscopicum (Nägeli ex Kützing) Nägeli, 1858 (additional source)
Acrochaetium minimum Collins, 1908 accepted as Colaconema minimum (Collins) Woelkerling, 1973 (basis of record)
Acrochaetium moniliforme (Rosenvinge) Børgesen, 1915 (additional source)
Acrochaetium parvulum (Kylin) Hoyt, 1920 (additional source)
Acrochaetium pulvereum Nägeli, 1862 (basis of record)
Acrochaetium rosulatum (Rosenvinge) Papenfuss, 1945 accepted as Kylinia rosulata Rosenvinge, 1909 (basis of record)
Acrochaetium sanctae-mariae (Darbishire) Hamel, 1927 (additional source)
Acrochaetium sanctae-mariae (Darbishire) Hamel, 1927 (basis of record)
Acrochaetium savianum (Meneghini) Nägeli, 1862 accepted as Colaconema savianum (Meneghini) R.Nielsen, 1994 (basis of record)
Acrochaetium savianum (Meneghini) Nägeli, 1862 accepted as Colaconema savianum (Meneghini) R.Nielsen, 1994 (additional source)
Acrochaetium scapae (Lyle) Papenfuss, 1945 (basis of record)
Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (additional source)
Acrochaetium seiriolanum (Harvey-Gibson) Hamel, 1927 (basis of record)
Acrochaetium seiriolanum (Gibson) Rosenvinge, 1924 accepted as Acrochaetium seiriolanum (Harvey-Gibson) Hamel, 1927 (additional source)
Acrochaetium sparsum (Harvey) Nägeli, 1862 (additional source)
Acrochaetium stilophorae (Levring) Kylin, 1944 (additional source)
Acrochaetium subtilissimum (Kützing) Hamel, 1927 accepted as Colaconema subtilissimum (Kützing) Alongi, Cormaci & G.Furnari, 2017 (additional source)
Acrochaetium subtilissimum (Kützing) Hamel, 1927 accepted as Colaconema subtilissimum (Kützing) Alongi, Cormaci & G.Furnari, 2017 (basis of record)
Acrochaetium unifilum C.-C.Jao, 1936 (additional source)
Acrochaetium virgatulum (Harvey) Batters, 1902 accepted as Acrochaetium secundatum (Lyngbye) Nägeli, 1858 (additional source)
Acrosiphonia J.Agardh, 1846 (additional source)
Acrosiphonia arcta (Dillwyn) Gain, 1912 (additional source)
Acrosiphonia centralis (Lyngbye) Kjellman, 1893 accepted as Acrosiphonia arcta (Dillwyn) Gain, 1912 (additional source)
Acrosiphonia sonderi (Kützing) Kornmann, 1962 (additional source)
Acrosiphonia spinescens (Kützing) Kjellman, 1893 (additional source)
Acrosiphoniaceae S. Jónsson, 1959 (basis of record)
Acrosorium Zanardini ex Kützing, 1869 (additional source)
Acrosorium ciliolatum (Harvey) Kylin, 1924 (basis of record)
Acrosorium reptans (P.Crouan & H.Crouan) Kylin, 1924 accepted as Cryptopleura ramosa (Hudson) L.Newton, 1931 (basis of record)
Acrosorium reptans (P.Crouan & H.Crouan) Kylin, 1924 accepted as Cryptopleura ramosa (Hudson) L.Newton, 1931 (source of synonymy)
Acrosorium venulosum (Zanardini) Kylin, 1924 (additional source)
Acrosorium venulosum (Zanardini) Kylin, 1924 (basis of record)
Acrothrix Kylin, 1907 (additional source)
Acrothrix gracilis Kylin, 1907 (additional source)
Acrothrix neglecta (Batters) Kuckuck, 1929 (basis of record)
Actinastrum Lagerheim, 1882 (additional source)
Actinastrum fluviatile (J.L.B.Schröder) Fott, 1977 (additional source)
Actinastrum hantzschii Lagerheim, 1882 (additional source)
Actinastrum hantzschii var. fluviatile J.B.L.Schröder, 1899 accepted as Actinastrum fluviatile (J.L.B.Schröder) Fott, 1977 (basis of record)
Actinema Reinsch, 1874-1875 (basis of record)
Actinema scutellum Reinsch, 1875 (basis of record)
Actinomonadaceae Kent, 1881 (basis of record)
Acutodesmus (Hegewald) Tsarenko, 2001 (basis of record)
Acutodesmus acuminatus (Lagerheim) P.M.Tsarenko, 2000 accepted as Tetradesmus lagerheimii M.J.Wynne & Guiry, 2016 (basis of record)
Acutodesmus dimorphus (Turpin) P.M.Tsarenko, 2001 accepted as Tetradesmus dimorphus (Turpin) M.J.Wynne, 2016 (basis of record)
Acutodesmus obliquus (Turpin) Hegewald & Hanagata, 2000 accepted as Tetradesmus obliquus (Turpin) M.J.Wynne, 2016 (basis of record)
Aduncodinium N.S.Kang, H.J.Jeong & Ø.Moestrup, 2014 (additional source)
Aduncodinium glandula (E.C.Herdman) N.S.Kang, H.J.Jeong & Moestrup, 2015 (additional source)
Aduncodinium glandula (E.C.Herdman) N.S.Kang, H.J.Jeong & Moestrup, 2015 (basis of record)
Aegagropila Kützing, 1843 (basis of record)
Aegagropila brownii (Dillwyn) Kützing, 1854 (basis of record)
Aegagropila linnaei Kützing, 1843 accepted as Aegagropila brownii (Dillwyn) Kützing, 1854 (basis of record)
Agardhiella F.Schmitz, 1897 (additional source)
Agardhiella subulata (C.Agardh) Kraft & M.J.Wynne, 1979 (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