Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
       Subkingdom Pteridobiotina Britton & A. Br. (1896)
         Superphylum Pteridophytanae Doweld (2001)
           Phylum Pteridophyta Schimp. (1879) see Phylum Filicinophyta
             Class Pteridopsida Ritgen (1828) see Order Polypodiales Link (1833)
               Subclass Pterididae Schmakov (2001) [monotypic]
                 Order Pteridales Doweld (2001) see Order Polypodiales Link (1833)
                   1 Family Pteridaceae E.D.M.Kirchn. (1831) - pteroids
                   2 Family Platyzomataceae Nakai (1950) see Subfamily Platyzomatoideae (Nakai) A.F.Tryon
                   3 Family Adiantaceae Newman (1840), nom. cons. - maidenhairs see Subfamily Adiantoideae Horvat (1927)
                   4 Family Vittariaceae Ching (1940) - shoestring ferns see Subfamily Adiantoideae Horvat (1927)