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 †Pteridospermophyta
             a Order †Calamopityales Němejc (1963)
             b Order †Buteoxylonales
             c Order †Lyginopteridales Havlena (1961)
             d Order †Medullosales Havlena (1961) see Order Pachytestales Doweld (2001)
             e Order †Callistophytales Rothwell (1981)
             f Order †Glossopteridales Melville (1960) see Order Rigbyales Doweld (2001)
             g Order †Peltaspermales Delevoryas (1979)
             h Order †Caytoniales E.Wulff (1926)
             i Order †Corystospermales Thomas (1933)
             j Order †Petriellales T.N.Taylor, Fueyo & E.L.Taylor (1994)