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 Cycadophyta Bessey (1907) Class †Cycadeoideopsida D.H.Scott (1923) [monotypic] Order †Cycadeoideales E.W.Berry (1916) Family †Williamsoniaceae Nath. (1913) Genus †Weltrichia Braun (1847)