Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Biota
           "neomura"
             Domain Eukaryota Chatton, 1925 - eukaryotes
               neokaryotes Cavalier-Smith 1993 - mitochondrial eukaryotes
                 neozoa Cavalier-Smith 1993
                   Superkingdom Corticata Lankester, 1878
                     Kingdom Plantae Haeckel (1866) - plants
                       Subkingdom Viridiplantae Caval.-Sm. (1981) - green plants
                         Infrakingdom Streptophyta C. Jeffrey (1967)
                           Superphylum Embryophyta
                             "polysporangiophytes"
                               Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998) - vascular plants
                                 [Subphylum] Euphyllophytina
                                   [Infraphylum] "Moniliformopses" Kenrick & Crane, 1997, nom. inval. - monilophytes
                                     Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966) - ferns
                                       "core leptosporangiates"
                                         Order Polypodiales Link (1833) - polypods
                                           Family Pteridaceae E.D.M. Kirchn. - pteroids
                                             1 Subfamily Platyzomatoideae [monotypic]
                                             2 Subfamily Parkerioideae
                                             3 Subfamily Taenitidoideae
                                             4 Subfamily Cheilanthoideae
                                             5 Subfamily Adiantoideae
                                             6 Subfamily Pteridoideaeᵀ