Acanthophora J.V.Lamouroux, 1813 (additional source)
Acanthophora spicifera (M.Vahl) Børgesen, 1910 (additional source)
Acinetosporaceae Hamel ex J. Feldmann, 1937 (basis of record)
Acrochaetium Nägeli, 1858 (additional source)
Acrochaetium robustum Børgesen, 1915 accepted as Colaconema robustum (Børgesen) Huisman & Woelkerling, 2018 (basis of record)
Acrochaetium robustum Børgesen, 1915 accepted as Colaconema robustum (Børgesen) Huisman & Woelkerling, 2018 (additional source)
Acrosorium Zanardini ex Kützing, 1869 (additional source)
Acrosorium yendoi Yamada, 1930 (basis of record)
Actinotrichia Decaisne, 1842 (additional source)
Actinotrichia fragilis (Forsskål) Børgesen, 1932 (additional source)
Ahnfeltiopsis P.C.Silva & DeCew, 1992 (additional source)
Ahnfeltiopsis flabelliformis (Harvey) Masuda, 1993 (additional source)
Akashiwo G.Hansen & Moestrup, 2000 (additional source)
Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000 (basis of record)
Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000 (additional source)
Alexandrium Halim, 1960 (additional source)
Alexandrium catenella (Whedon & Kofoid) Balech, 1985 (additional source)
Alexandrium tamarense (Lebour) Balech, 1995 (basis of record)
Alexandrium tamarense (Lebour) Balech, 1995 (additional source)
Aliterellaceae J.Rigonato & al., 2016 (basis of record)
Amphidinium Claperède & Lachmann, 1859 (additional source)
Amphidinium longum Lohmann, 1908 (additional source)
Amphiroa J.V.Lamouroux, 1812 (additional source)
Amphiroa anceps (Lamarck) Decaisne, 1842 (additional source)
Amphiroa ephedraea (Lamarck) Decaisne, 1842 (additional source)
Amphiroa valonioides Yendo, 1902 (basis of record)
Amylax Meunier, 1910 (additional source)
Amylax triacantha (Jørgensen) Sournia, 1984 (basis of record)
Amylax triacantha (Jørgensen) Sournia, 1984 (additional source)
Aphanizomenonaceae Elenkin, 1938 (basis of record)
Aphanocapsa C.Nägeli, 1849 (basis of record)
Aphanocapsa banaresensis Bharadwaja, 1935 (basis of record)
Aphanocapsa biformis A.Braun, 1879 (basis of record)
Aphanocapsa conferta (West & G.S.West) Komárková-Legnerová & Cronberg, 1994 (basis of record)
Aphanocapsa elachista West & G.S.West, 1894 (source of synonymy)
Aphanocapsa elachista var. conferta West & G.S.West, 1912 accepted as Aphanocapsa conferta (West & G.S.West) Komárková-Legnerová & Cronberg, 1994 (basis of record)
Aphanocapsa litoralis Hansgirg, 1892 (basis of record)
Aphanocapsa muscicola (Meneghini) Wille, 1919 (basis of record)
Aphanocapsa sesciacensis Frémy, 1928 (basis of record)
Aphanothecaceae (J.Komárek & Anagnostidis) J.Komárek, J.Kastovsky, Mareš & J.R.Johansen, 2014 (basis of record)
Aphanothece Nägeli, 1849 (additional source)
Aphanothece elabens (Meneghini) Elenkin, 1936 (basis of record)
Archaeperidinium Jörgensen, 1912 (basis of record)
Archaeperidinium minutum (Kofoid) Jørgensen, 1912 (basis of record)
Asparagopsis Montagne, 1840 (additional source)
Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, 1845 (basis of record)
Asterocladaceae T.Silberfeld, M.-F.Racault, R.L.Fletcher, A.F.Peters, F.Rousseau & B.de Reviers, 2011 (basis of record)
Asterocladales (basis of record)
Asterocladon D.G.Müller, E.R.Parodi & A.F.Peters, 1999 (basis of record)
Asterocladon rhodochortonoides (Børgesen) S.Uwai, C.Nagasato, T.Motomura & K.Kogame, 2005 (basis of record)
Asteronema Delépine & Asensi, 1975 (additional source)
Asteronema breviarticulatum (J.Agardh) Ouriques & Bouzon, 2000 (basis of record)
Asteronemataceae (basis of record)
Balechina Loeblich Jr. & Loeblich III, 1968 (additional source)
Balechina gracilis (Bergh) F.Gómez, Artigas & Gast, 2021 (basis of record)
Bangia Lyngbye, 1819 (additional source)
Bangia atropurpurea (Mertens ex Roth) C.Agardh, 1824 (additional source)
Bangia fuscopurpurea (Dillwyn) Lyngbye, 1819 (additional source)
Barrufeta N.Sampedro & S.Fraga, 2011 (basis of record)
Barrufeta resplendens (Hulburt) H.Gu, Z.Luo & K.N.Mertens, 2015 (basis of record)
Bonnemaisoniales (basis of record)
Boodlea G.Murray & De Toni, 1889 (additional source)
Boodlea composita (Harvey) F.Brand, 1904 (additional source)
Boodleopsis A.Gepp & E.S.Gepp, 1911 (additional source)
Boodleopsis pusilla (Collins) W.R.Taylor, A.B.Joly & Bernatowicz, 1953 (basis of record)
Boodleopsis pusilla (Collins) W.R.Taylor, A.B.Joly & Bernatowicz, 1953 (additional source)
Bostrychia Montagne, 1842 (additional source)
Bostrychia tenella (J.V.Lamouroux) J.Agardh, 1863 (additional source)
Brachytrichia Zanardini ex Bornet & Flahault, 1886 (additional source)
Brachytrichia maculans Gomont, 1901 accepted as Kyrtuthrix maculans (Gomont) I.Umezaki, 1958 (additional source)
Brachytrichia quoyi Bornet & Flahault, 1886 (additional source)
Bryopsidineae (basis of record)
Bryopsis J.V.Lamouroux, 1809 (additional source)
Bryopsis muscosa J.V.Lamouroux, 1809 (additional source)
Bryopsis plumosa (Hudson) C.Agardh, 1823 (additional source)
Callithamnieae Schmitz, 1889 (basis of record)
Callithamnioideae De Toni, 1903 (basis of record)
Callithamnion Lyngbye, 1819 (additional source)
Callithamnion corymbosum (Smith) Lyngbye, 1819 (additional source)
Caloglossa (Harvey) G.Martens, 1869 (additional source)
Caloglossa leprieurii (Montagne) J.Agardh, 1876 accepted as Caloglossa leprieurii (Montagne) G.Martens, 1869 (basis of record)
Caloglossa leprieurii (Montagne) G.Martens, 1869 (additional source)
Calothrix C.Agardh ex Bornet & Flahault, 1886 (additional source)
Calothrix contarenii Bornet & Flahault, 1886 (additional source)
Calothrix crustacea Thuret ex Bornet & Flahault, 1886 accepted as Scytonematopsis crustacea (Thuret ex Bornet & Flahault) Koválik & Komárek, 1988 (additional source)
Calothrix javanica De Wildeman, 1897 (basis of record)
Calothrix scopulorum C.Agardh ex Bornet & Flahault, 1886 (additional source)
Carteria Diesing, 1866 (basis of record)
Carteria multifilis (Fresenius) O.Dill, 1895 (basis of record)
Catenella Greville, 1830 (additional source)
Catenella nipae Zanardini, 1872 (additional source)
Caulacanthus Kützing, 1843 (additional source)
Caulacanthus okamurae Yamada, 1933 (basis of record)
Caulacanthus ustulatus (Turner) Kützing, 1843 (basis of record)
Caulerpa J.V.Lamouroux, 1809 (additional source)
Caulerpa chemnitzia (Esper) J.V.Lamouroux, 1809 (basis of record)
Caulerpa cupressoides (Vahl) C.Agardh, 1817 (additional source)
Caulerpa cupressoides var. lycopodium Weber Bosse, 1898 (basis of record)
Caulerpa peltata J.V.Lamouroux, 1809 accepted as Caulerpa chemnitzia (Esper) J.V.Lamouroux, 1809 (additional source)
Caulerpa racemosa (Forsskål) J.Agardh, 1873 (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