Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Phylum Acritarcha †
- Phylum Algae (awaiting allocation)
- Phylum Algae incertae sedis
- Phylum Anthocerotophyta
- Phylum Bryophyta
- Class Andreaeobryopsida
- Class Andreaeopsida
- Class Bryophyta (awaiting allocation)
- Class Bryopsida
- Order Archidiales
- Order Aulacomniales accepted as Rhizogoniales
- Order Bryales
- Order Bryopsida (awaiting allocation)
- Order Buxbaumiales
- Order Dawsoniales
- Order Dicranales
- Order Encalyptales
- Order Fissidentales
- Order Funariales
- Order Grimmiales
- Order Hedwigiales
- Order Hookeriales
- Order Hypnales
- Family Anomodontaceae N.C. Kindberg, 1897
- Family Calliergonaceae (H. Kanda) A. Vanderpoorten, L. Hedenäs, C.J. Cox & A.J. Shaw, 2002
- Family Cinclidotaceae W.P. Schimper, 1860
- Family Heterocladiellaceae M.S. Ignatov & V.E. Fedosov in Ignatov et al., 2019
- Family Myuriaceae M. Fleischer, 1923
- Family Orthorrhynchiaceae S.-H. Lin, 1983
- Family Orthostichellaceae J. Enroth, S. Huttunen, R. Tangney, M. Stech & D. Quandt in Enroth et al., 2019
- Family Pterigynandraceae W.P. Schimper, 1876
- Family Pylaisiaceae W.P. Schimper, 1860
- Family Pylaisiadelphaceae B. Goffinet & W.R. Buck, 2004
- Family Sematophyllaceae
- Genus Acanthocladium Mitten, 1878
- Genus Acanthodium Mitten, 1868
- Genus Acanthorrhynchium M. Fleischer, 1923
- Genus Acritodon H. Robinson, 1964
- Genus Allioniella V.F. Brotherus, 1911
- Genus Allioniellopsis R. Ochyra, 1982
- Genus Aptychopsis (V.F. Brotherus) M. Fleischer, 1923
- Genus Brittonodoxa W.R. Buck, P.E.A.S. Câmara & M. Carvalho-Silva in Carvalho-Silva et al., 2017
- Genus Cephalocladium A.S. Lazarenko, 1946
- Genus Chionostomum Müller Hal., 1869
- Genus Clastobryella M. Fleischer, 1923
- Genus Clastobryophilum M. Fleischer, 1923
- Genus Clastobryopsis M. Fleischer, 1923
- Genus Colobodontium Herzog, 1951
- Genus Donnellia C.F. Austin, 1880
- Genus Fallaciella H.A. Crum, 1991
- Genus Foreauella Dixon & P. Varde, 1927
- Genus Gammiella V.F. Brotherus in Engler & Prantl, 1908
- Genus Hageniella V.F. Brotherus, 1910
- Genus Heterophyllium (W.P. Schimper) J.K.A. Müller ex N.C. Kindberg, 1894
- Genus Heterophyllum Müller Hal. ex Kindberg, 1894 accepted as Heterophyllium (W.P. Schimper) J.K.A. Müller ex N.C. Kindberg, 1894
- Genus Horridohypnum W.R. Buck, 1981
- Genus Jirivanaea U.B. Deshmukh & O.S. Rathor, 2021
- Genus Leptorrhynchohypnum Hampe, 1876 accepted as Leptorrhyncho-Hypnum Hampe, 1876
- Genus Leptorrhyncho-Hypnum Hampe, 1876
- Genus Ligulina Müller Hal., 1901
- Genus Limnobiella (Müller Hal.) Müller Hal., 1901
- Genus Maguireella W.R. Buck, 1990
- Genus Mahua W.R. Buck, 1983
- Genus Mastopoma J. Cardot, 1901
- Genus Meiotheciella B.C. Tan, W.B. Schofield & H.P. Ramsay, 1998
- Genus Meiotheciopsis V.F. Brotherus in Engler & Prantl, 1908
- Genus Meiothecium Mitten, 1868
- Genus Microcalpe R. Spruce, 1867
- Genus Miothecium I. Hagen, 1910 accepted as Meiothecium Mitten, 1868
- Genus Neohypnella E.B. Bartram, 1928
- Genus Palisadula R. Toyama, 1937
- Genus Papillidiopsis (V.F. Brotherus) W.R. Buck & B.C. Tan, 1990
- Genus Paranapiacabaea W.R. Buck & D.M. Vital, 1992
- Genus Pocsia M. Carvalho-Silva, P.E.A.S. Câmara & W.R. Buck in Carvalho-Silva et al., 2017
- Genus Potamium Mitten, 1869
- Genus Pseudohypnella (V.F. Brotherus) M. Fleischer, 1923
- Genus Pseudopiloecium Bartram, 1943
- Genus Pseudotrismegistia H. Akiyama & H. Tsubota, 2001
- Genus Pterogonidium Müller Hal., 1897
- Genus Pterogoniella W.P. Schimper ex V.F. Brotherus, 1897
- Genus Pterogoniopsis Müller Hal., 1879
- Genus Pungentella Müller Hal., 1897
- Genus Radulina W.R. Buck & B.C. Tan, 1989
- Genus Rhaphidostegiopsis M. Fleischer, 1905 accepted as Wijkia H.A. Crum, 1971
- Genus Rhaphidostichum M. Fleischer, 1923
- Genus Rhynchohypnum (Hampe) Hampe, 1878 accepted as Rhyncho-hypnum (Hampe) Hampe in Warming, 1878
- Genus Rhyncho-hypnum (Hampe) Hampe in Warming, 1878
- Genus Schraderella Müller Hal., 1879
- Genus Schraderobryum M. Fleischer, 1923
- Genus Schroeterella Herzog, 1916
- Genus Sematophyllites J.-P. Frahm, 2006
- Genus Sematophyllum W. Mitten, 1864
- Genus Struckia Müller Hal., 1893
- Genus Syringothecium Mitten, 1869
- Genus Timotimius W.R. Buck, 1999
- Genus Trismegistia (Müller Hal.) V.F. Brotherus in Engler & Prantl, 1908
- Genus Tristichella H.N. Dixon, 1932
- Genus Trolliella T. Herzog, 1939
- Genus Vitalia P.E.A.S. Câmara, M. Carvalho-Silva & W.R. Buck in Carvalho-Silva et al., 2017 accepted as Jirivanaea U.B. Deshmukh & O.S. Rathor, 2021
- Genus Warburgiella Müller Hal. ex V.F. Brotherus, 1900
- Genus Wijkia H.A. Crum, 1971
- Genus Wijkiella M. Bizot & J. Lewinsky in M. Bizot et al., 1978
- Species Wijkiella kenyae Bizot & Lewinsky in Bizot et al., 1978
- Family Stereophyllaceae
- Family Symphyodontaceae M. Fleischer, 1923
- Family Thamnobryaceae
- Family Theliaceae
- Family Trachylomataceae (M. Fleischer) W.R. Buck & D.H. Vitt, 1986
- Order Hypnobryales
- Order Isobryales
- Order Leucodontales
- Order Orthodontiales accepted as Rhizogoniales
- Order Orthotrichales
- Order Pleurocarpae (awaiting allocation)
- Order Pottiales
- Order Protosphagnales †
- Order Pseudoditrichales
- Order Rhizogoniales
- Order Scouleriales
- Order Seligeriales accepted as Grimmiales
- Order Splachnales
- Family Flexitrichaceae M.S. Ignatov & V.E. Fedosov in Fedosov et al., 2016
- Family Tricostaceae G.W.K. Shelton, R.A. Stockey, G.R. Rothwell & A.M.F. Tomescu, 2015 †
- Genus Capimirinus I.C. Christiano De Souza, F.S. Ricardi Branco & Y.L. Vargas, 2012 †
- Genus Livingstonites E.I. Vera, 2011 †
- Genus Vetiplanaxis N.E. Bell in N.E. Bell & P.V. York, 2007 †
- Class Hepaticopsida accepted as Marchantiophyta
- Class Oedipodiopsida
- Class Polytrichopsida
- Class Sphagnopsida
- Class Takakiopsida
- Class Tetraphidopsida
- Genus Heinrichsiella A.C. Bippus, A. Savoretti, I.H. Escapa, J. Garcia-Massini & D. Guido, 2019 †
- Phylum Calcitarcha †
- Phylum Charophyta
- Phylum Chlorophyta
- Phylum Eophyta †
- Phylum Glaucophyta
- Phylum Gymnospermophyta accepted as Tracheophyta
- Phylum Horneophyta †
- Phylum Magnoliophyta accepted as Tracheophyta
- Phylum Marchantiophyta
- Phylum Picozoa
- Phylum Plantae (awaiting allocation)
- Phylum Prasinodermatophyta
- Phylum Pteridophyta accepted as Tracheophyta
- Phylum Rhodelphidia
- Phylum Rhodophyta
- Phylum Sporae dispersae †
- Phylum Tracheophyta
- Phylum Vendophyta † accepted as Algae incertae sedis
- Class Nematophyceae † accepted as Nematophyta †
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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