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 †Cladoxylophyta Doweld (2001) [monotypic] see Division Monilophyta Cantino & Donoghue
             Class †Cladoxylopsida Novák (1930) - cladoxylopsids see Class Equisetopsida C.Agardh (1825)
               Order †Hyeniales W.Zimm. (1930) see Order Cladoxylales W.Zimm. (1930)
                 1 Family †Hyeniaceae Hirmer (1933)
                 2 Family †Calamophytaceae Kräusel & Weyland (1927) see Family Hyeniaceae Hirmer (1933)