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 Cyatheopsida Doweld (2001) see Order Cyatheales A.B.Frank (1877)
               Subclass Plagiogyriidae Doweld (2001) [monotypic]
                 1 Order Plagiogyriales Pic.Serm. ex Reveal (1993) [monotypic] see Order Cyatheales A.B.Frank (1877)