Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Subkingdom Pteridobiotina Britton & A. Br. (1896) Superdivision Pteridophytanae Doweld (2001) [monotypic] see Superphylum Pteridophytanae Doweld (2001) Division Monilophyta Cantino & Donoghue Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966) - ferns Order Salviniales Link (1833) - water ferns Family Marsileaceae Mirb. (1802) - clover ferns Genus Regnellidium Lindm. (1904)