vegetable kingdom
   Cryptogams
     Class Acrogens Lindl.
       Alliance Filicales Dumort.
         I Natural order Filices Juss. (1789)
         II Natural order Ophioglossaceæ Martynov
         III [Natural order] Equisetaceæ Michx. ex DC.
         IV Natural order Marsileaceæ Mirb.
         V [Natural order] Lycopodiaceæ P.Beauv. ex Mirb.