Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Bryobiotina Campb. (1890)
     Division Marchantiophyta Stotler & Crand.-Stotl. (2000) see Phylum Marchantiophyta Stotler & Crand.-Stotl. (2000)
       Class Haplomitriopsida Stotler & Crand.-Stotl. (1977)
         Subclass Haplomitriidae Stotler & Crand.-Stotl. [monotypic]
           Order Calobryales Hamlin [monotypic]
             Family Haplomitriaceae Dedecek [monotypic]
               Genus Haplomitrium Nees (1833), nom. cons.