Phylum Bryophyta A.Braun (1864) - bryophytes
   Class Bryopsida McClatchie (1897) - mosses
     Subclass Dicranidae Doweld (2001)
       Order Grimmiales M. Fleisch.
         Family Ptychomitriaceae Schimp.
           Genus Ptychomitrium Fürnr. (1829), nom. cons., orth. cons.