vegetable kingdom
   Cryptogams
     Class Acrogens Lindl.
       Alliance Muscales Lindl. [monotypic]
         Natural order Musci Hedw. (1801)
           I Schistocarpi Mont.
           II Syncladei Berk.
           III Acrocarpi Brid..
           IV Cladocarpi Mont.
           V Pleurocarpi Brid..