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 Cycadophytanae Doweld (2001)
           Phylum †Lyginopteridophyta Doweld (2001) [monotypic] see Division Pteridospermatophyta Meyen
             Class †Lyginopteridopsida Novák (1961)
               Order †Lyginopteridales Havlena (1961)
                 Family †Physostomataceae A.G. Long (1975)