Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Lycopodiobiotina Doweld (2001)
     Division †Zosterophyllophyta H.C.Bold (1973) see Phylum Zosterophyllophyta H.C.Bold (1973)
       Class †Zosterophyllopsida Foster & Gifford (1974)
         Order †Sawdoniales Kenrick & Crane (1997)
           1 Family †Hsueaceae Kenrick & Crane (1997) [monotypic]
           2 Family †Sawdoniaceae Kenrick & Crane (1997) [monotypic]
           3 Family †Gosslingiaceae H. Banks (1968) [monotypic]