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 †Pteridospermatophyta Meyen Class †Moresnetiopsida Doweld (2001) a Order †Moresnetiales Doweld (2001) b Order †Pullarithecales Doweld (1998) c Order †Tetrastichiales Němejc (1968) [monotypic] d Order †Calamopityales Němejc (1963) [monotypic]