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
- Order Ishigeales
- Order Laminariales
- Family Agaraceae A. Postels & F. Ruprecht, 1840
- Family Alariaceae Setchell & Gardner, 1925
- Family Arthrothamnaceae accepted as Laminariaceae Bory, 1827
- Family Aureophycaceae H. Kawai & L.M. Ridgway in Kawai et al., 2013
- Family Costariaceae C.E. Lane, C. Mayes, L.D. Druehl & G.W. Saunders, 2006 accepted as Agaraceae A. Postels & F. Ruprecht, 1840
- Family Laminariaceae Bory, 1827
- Genus Arthrothamnus Ruprecht, 1848
- Genus Cimazone de la Pylaie, 1830 accepted as Saccharina Stackhouse, 1809
- Genus Cymathaere J.G. Agardh, 1868
- Genus Cymathere accepted as Cymathaere J.G. Agardh, 1868
- Genus Debarya J. Rostafinski, 1877
- Genus Gigantea Stackhouse, 1816 accepted as Laminaria J.V.F. Lamouroux, 1813
- Genus Hafgygia Kützing, 1843 accepted as Laminaria J.V.F. Lamouroux, 1813
- Genus Hedophyllum Setchell, 1901
- Genus Kjellmaniella Miyabe, 1902
- Genus Kjellmanniella K. Miyabe, 1902
- Genus Laminaria J.V.F. Lamouroux, 1813
- Genus Macrocystis C.A. Agardh, 1820
- Genus Myriotrema Bachelot De La Pylaie, 1830
- Genus Nereocystis Postels & Ruprecht, 1840
- Genus Neurophora Bachelot de la Pylaie, MS (?)
- Genus Oxyglossum J.E. Areschoug, 1880
- Genus Pelagophycus J.E. Areschoug, 1881
- Genus Phloeorhiza Kützing, 1843
- Genus Phycocastanum Kützing, 1843 accepted as Saccorhiza Bachelot de la Pylaie, 1830
- Genus Phycodendrum O. Kuntze, 1898
- Genus Polyschidea Stackhouse, 1809
- Genus Postelsia Ruprecht, 1852
- Genus Pseudolessonia G.Y. Cho, N.G. Klochkova, T.N. Krupnova & S.M. Boo, 2006
- Genus Renfrewia R.F. Griggs, 1906
- Genus Saccharina Stackhouse, 1809
- Genus Streptophyllopsis Kajimura, 1981
- Genus Streptophyllum K. Miyabe & M. Nagai in Nagai, 1940
- Genus Tauya N.G. Klochkova & T.N. Krupnova, 2004
- Family Lessoniaceae Setchell & Gardner, 1925
- Genus Costularia Y. Petrov & I. Gusarova in I. Gusarova & Y. Petrov, 1971 accepted as Costulariella N.G. Kloczcova & T.A. Kloczcova, 2010
- Genus Costulariella N.G. Kloczcova & T.A. Kloczcova, 2010
- Genus Feditia Y. Petrov & I. Gusarova in Gusarova & Petrov, 1972
- Genus Halophytis J. Sang, 1885 †
- Genus Phyllariella Y.E. Petrov & V.B. Vozzhinskaya, 1966
- 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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