Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Cycadophytanae Doweld (2001) see Superphylum Cycadophytanae Doweld (2001)
       Division †Progymnospermophyta Bold et al. see Phylum Progymnospermophyta Lang (1925)
         Class †Noeggerathiopsida Krysht. (1934)
           a Order †Noeggerathiales Darrah (1939) [monotypic]
           b Order †Discinitales Doweld (2001) [monotypic]
           c Order †Tingiales Zimmerm. (1959) [monotypic]