organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Viridaeplantae Cavalier-Sm. (1981) - green plants see [unranked] Viridiplantae Cavalier-Smith, 1981
         Land plants
           Phylum Pteridophyta Schimp. (1879) see Phylum Filicinophyta
             a Class †Cladoxylopsida Novák (1930) - cladoxylopsids see Class Equisetopsida C.Agardh (1825)
             b †early fernlike plants see Order Coenopteridales Delevoryas & Morgan
             c eusporangiates - eusporangiate ferns
             d leptosporangiates - leptosporangiate ferns