Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Pteridophytanae Doweld (2001) [monotypic] see Superphylum Pteridophytanae Doweld (2001)
       Division Monilophyta Cantino & Donoghue
         A Class Psilotopsida D.H.Scott (1909) see Subclass Ophioglossidae Klinge (1882)
         B Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
         C Class Marattiopsida Doweld (2001) see Subclass Marattiidae Klinge (1882)
         D Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966) - ferns