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) Order †Calamopityales Němejc (1963) [monotypic] Family †Calamopityaceae D.H.Scott (1909) Genus †Bostonia W.E. Stein & C.B.Beck (1978)