Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Subkingdom Hacrobia
- Subkingdom Harosa
- Infrakingdom Halvaria
- Superphylum Alveolata
- Superphylum Heterokonta
- Phylum Bacillariophyta
- Phylum Bigyra
- Phylum Chrysophyta accepted as Ochrophyta
- Phylum Diatomaceae accepted as Bacillariophyta
- Phylum Eustigmatophyta accepted as Ochrophyta
- Phylum Heterokontophyta accepted as Ochrophyta
- Phylum Hyphochytriomycota accepted as Pseudofungi
- Phylum Labyrinthista accepted as Bigyra
- Phylum Ochrophyta
- Class Aurearenophyceae accepted as Phaeothamniophyceae
- Class Aurophyceae accepted as Phaeothamniophyceae
- Class Bolidophyceae
- Class Chrysomeridophyceae
- Class Chrysoparadoxophyceae
- Class Chrysophyceae
- Class Dictyochophyceae
- Class Eustigmatophyceae
- Class Hyphochytriomycetes accepted as Hyphochytrea
- Class Olisthodiscophyceae
- Class Pelagophyceae
- Class Phaeophyceae
- Order Ascoseirales
- Order Asterocladales
- Order Chordales
- Order Chordariales accepted as Ectocarpales
- Order Cutleriales accepted as Tilopteridales
- Order Desmarestiales
- Order Dictyosiphonales accepted as Ectocarpales
- Order Dictyotales
- Order Discosporangiales
- Order Durvillaeales accepted as Fucales
- Order Ectocarpales
- Order Fucales
- Family Bifurcariopsidaceae
- Family Cystoseiraceae De Toni, 1891 accepted as Sargassaceae Kützing, 1843
- Family Durvillaeaceae (Oltmanns) De Toni, 1891
- Family Fucaceae Adanson, 1763
- Family Himanthaliaceae (Kjellman) De Toni, 1891
- Family Hormosiraceae Fritsch, 1945
- Family Notheiaceae O.C. Schmidt, 1938
- Family Phyllosporaceae accepted as Seirococcaceae Nizamuddin, 1962
- Family Sargassaceae Kützing, 1843
- Genus Abrotanifolia Stackhouse, 1809 accepted as Cystoseira C.A. Agardh, 1820
- Genus Acinaria Donati, 1758 accepted as Sargassum C.A. Agardh, 1820
- Genus Acinarius H.F.A. Roussel, 1806
- Genus Acrocarpia J.E. Areschoug, 1854
- Genus Acystis Schiffner, 1934
- Genus Algogrunowia O. Kuntze, 1891
- Genus Anthophycus Kützing, 1849
- Genus Axillariella P.C. Silva, 1959
- Genus Baccalaria S.F. Gray, 1821
- Genus Baccifer Roussel, 1806 accepted as Cystoseira C.A. Agardh, 1820
- Genus Bactrophycus J.G. Agardh accepted as Sargassum C.A. Agardh, 1820
- Genus Bifuracaria accepted as Bifurcaria Stackhouse, 1809
- Genus Bifurcaria Stackhouse, 1809
- Genus Blossevillea Decaisne, 1840 accepted as Cystophora J.G. Agardh, 1841
- Genus Blosvillea Decaisne, 1840 accepted as Cystophora J.G. Agardh, 1841
- Genus Brassicophycus S.G.A. Draisma, E. Ballesteros, F. Rousseau & T. Thibaut, 2010
- Genus Carpacanthus Kützing, 1843 accepted as Sargassum C.A. Agardh, 1820
- Genus Carpoblepta Stackhouse, 1816
- Genus Carpodesmia Greville, 1830 accepted as Cystoseira C.A. Agardh, 1820
- Genus Carpoglossum Kützing, 1843
- Genus Carpophyllum Greville, 1830
- Genus Castraltia A. Richard in Dumont d'Urville, 1834
- Genus Caulocystis J.E. Areschoug, 1854
- Genus Cervina S.F. Gray, 1828
- Genus Cladophyllum Bula-Meyer, 1980
- Genus Coccophora Greville, 1830
- Genus Contarinia Endlicher & Diesing, 1845
- Genus Cymaduse J. Decaisne & G. Thuret, 1845
- Genus Cystophora J.G. Agardh, 1841
- Genus Cystophyllum J.G. Agardh, 1848 accepted as Cystoseira C.A. Agardh, 1820
- Genus Cystoseira C.A. Agardh, 1820
- Genus Enchophora J.G. Agardh, 1894 accepted as Scaberia Greville, 1830
- Genus Ericaria Stackhouse, 1809 accepted as Cystoseira C.A. Agardh, 1820
- Genus Funicularis
- Genus Gongolaria Boehmer in C.G. Ludwig, 1760 accepted as Cystoseira C.A. Agardh, 1820
- Genus Halerica Kützing, 1843 accepted as Cystoseira C.A. Agardh, 1820
- Genus Halidrys Lyngbye, 1819
- Species Halidrys canaliculata (Linnaeus) Stackhouse, 1809 accepted as Pelvetia canaliculata (Linnaeus) Decaisne & Thuret, 1845
- Species Halidrys dioica N.L. Gardner, 1913
- Species Halidrys murmanica A.D. Zinova, 1952
- Species Halidrys osmundacea (Turner) Harvey, 1840 accepted as Cystoseira osmundacea (Turner) C. Agardh, 1820
- Species Halidrys serrata (Linnaeus) Stackhouse, 1809 accepted as Fucus serratus Linnaeus, 1753
- Species Halidrys siliquosa (Linnaeus) Lyngbye, 1819
- Species Halidrys vesiculosus (Linnaeus) Stackhouse, 1809 accepted as Fucus vesiculosus Linnaeus, 1753
- Species Halidrys volubilis (Goodenough & Woodward) Stackhouse, 1809
- Genus Halochloa Kützing, 1843 accepted as Sargassum C.A. Agardh, 1820
- Genus Hizikia Okamura, 1932
- Genus Hormophysa Kützing, 1843
- Genus Landsburgia Harvey, 1855
- Genus Mackaia S.F. Gray, 1821
- Genus Makaia S.F. Gray, 1821
- Genus Monilifera Stackhouse, 1809 accepted as Cystoseira C.A. Agardh, 1820
- Genus Myagropsis Kützing, 1843
- Genus Myriadenia J. Decaisne, 1842
- Genus Myriodesma Decaisne, 1841
- Genus Neocontarinia O. Kuntze, 1891
- Genus Neoplatylobium O.C. Schmidt, 1938
- Genus Neurothalia Sonder, 1855
- Genus Nizamuddinia P.C. Silva, 1996
- Genus Oerstedtia Trevisan, 1848
- Genus Palaeohalidrys N.L. Gardner, 1924 †
- Genus Paleocystophora B.C. Parker & E.Y. Dawson, 1965 †
- Genus Phryganella Stackhouse, 1816 accepted as Cystoseira C.A. Agardh, 1820
- Genus Phycobotrys Kützing, 1843
- Genus Phyllacantha Kützing, 1843 accepted as Cystoseira C.A. Agardh, 1820
- Genus Phyllotricha J.E. Areschoug, 1854 accepted as Sargassum C.A. Agardh, 1820
- Genus Platylobium Kützing, 1849 accepted as Sargassum C.A. Agardh, 1820
- Genus Platythalia Sonder, 1845
- Genus Polycladia J.F.C. Montagne in A.C.V.D. d'Orbigny, 1847
- Genus Pterocaulon Kützing, 1843 accepted as Sargassum C.A. Agardh, 1820
- Genus Pycnophycus Kützing, 1843 accepted as Bifurcaria Stackhouse, 1809
- Genus Sargassopsis Nizamuddin, Hiscock, Barratt & Ormond, 1993 accepted as Nizamuddinia P.C. Silva, 1996
- Genus Sargassopsis Trevisan, 1843
- Genus Sargassum C.A. Agardh, 1820
- Genus Scaberia Greville, 1830
- Genus Scaenophora J.G. Agardh, 1899 accepted as Myriodesma Decaisne, 1841
- Genus Siliquaria Stackhouse, 1809 accepted as Halidrys Lyngbye, 1819
- Genus Siliquaria S.F. Gray, 1821 accepted as Halidrys Lyngbye, 1819
- Genus Siliquarius Roussel, 1806 accepted as Halidrys Lyngbye, 1819
- Genus Sirophysalis Kützing, 1843
- Genus Spongocarpus Kützing, 1843 accepted as Sargassum C.A. Agardh, 1820
- Genus Stephanocystis Trevisan, 1843
- Genus Stichophora (Endlichter) Kützing, 1845 accepted as Sargassum C.A. Agardh, 1820
- Genus Stokeyia F. Thivy & Y.A. Doshi, 1966 accepted as Cystoseira C.A. Agardh, 1820
- Genus Stolonophora Nizamuddin, 1969
- Genus Treptacantha Kützing, 1843
- Genus Turbinaria J.V.F. Lamouroux, 1825
- Genus Xiphophyllanthus O. Kuntze, 1880 accepted as Cystophora J.G. Agardh, 1841
- Family Seirococcaceae Nizamuddin, 1962
- Family Xiphophoraceae
- Genus Liasophycus P. Fliche, 1909 †
- Genus Staurofucus G.P. Radczenko in L.D. Kiparisova, B.P. Markovskij & G.P. Radczenko, 1956 †
- Order Ishigeales
- Order Laminariales
- Order Nemodermatales
- Order Onslowiales
- Order Phaeosiphoniellales
- Order Ralfsiales
- Order Scytosiphonales accepted as Ectocarpales
- Order Scytothamnales
- Order Sphacelariales
- Order Sporochnales
- Order Stschapoviales
- Order Syringodermatales
- Order Tilopteridales
- Family Archyfasmaceae Gnilovskaya, 2003 †
- Family Phaeophyceae (awaiting allocation)
- Genus Caulerpites (A.T. Brongniart) Sternberg, 1833 †
- Genus Dichothallus S.V. Naugolnykh, 2018 †
- Genus Gracilogia Ding in Ding et al., 1992 †
- Genus Houjiashania J. Liu et al., 2024 †
- Genus Jonssonia S. Lund, 1959
- Genus Miaohephyton M. Chen & Z.Z. Xiao, 1991 †
- Genus Phasganon Targioni-Tozzetti, 1826
- Genus Phasgonon Walker ex S.F. Gray, 1821
- Genus Pilonema Derbès & Solier, 1851
- Genus Porterinema Waern, 1952
- Genus Prototilopteris Funk, 1927 accepted as Zosterocarpus Bornet, 1890
- Genus Pseudobodanella J. Gerloff, 1967 accepted as Porterinema Waern, 1952
- Genus Sorapion Kuckuck, 1894
- Genus Zosterocarpus Bornet, 1890
- Class Phaeosacciophyceae
- Class Phaeothamniophyceae
- Class Picophagea accepted as Picophagophyceae
- Class Picophagophyceae
- Class Pinguiophyceae
- Class Raphidophyceae
- Class Schizocladiophyceae
- Class Synchromophyceae
- Class Synurophyceae accepted as Chrysophyceae
- Class Tribophyceae accepted as Xanthophyceae
- Class Xanthophyceae
- Family Ochrophyta incertae sedis
- Phylum Oomycota accepted as Pseudofungi
- Phylum Phaeophyta accepted as Ochrophyta
- Phylum Pseudofungi
- Phylum Raphidophyta accepted as Ochrophyta
- Phylum Sagenista accepted as Bigyra
- Phylum Xanthophyta accepted as Ochrophyta
- Subphylum Bigyromonada
- Class Bigyromonadea accepted as Developea
- Family Kaonashiidae Weston, Eglit & Simpson, 2023
- Infrakingdom Rhizaria
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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