Phylum Bryophyta A.Braun (1864) - bryophytes
   Class Bryopsida McClatchie (1897) - mosses
     Subclass Dicranidae Doweld (2001)
       Order Pottiales M. Fleisch.
         Family Pottiaceae Hampe (1853), nom. cons.
           Genus Willia Müll.Hal. (1890)