Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Bryobiotina Campb. (1890)
     Division Bryophyta A.Braun (1864) - mosses and liverworts see Phylum Bryophyta A.Braun (1864)
       Subdivision Bryophytina Engl. (1892) see Subphylum Bryophytina Engl. (1892)
         Class Polytrichopsida Doweld (2001) [monotypic]
           Order Polytrichales M. Fleisch. [monotypic]
             Family Polytrichaceae Schwägr.
               Genus Atrichum P.Beauv. (1804), nom. cons.