Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Subkingdom Bryobiotina Campb. (1890) Division Marchantiophyta Stotler & Crand.-Stotl. (2000) see Phylum Marchantiophyta Stotler & Crand.-Stotl. (2000) Class Marchantiopsida Cronquist, Takht. & W.Zimm. (1966) - thalloid liverworts Subclass Marchantiidae Engl. (1893) Order Sphaerocarpales Cavers (1910) Family Riellaceae Engl. [monotypic] 1 Genus Riella Mont. (1852)