Kingdom Plantae Haeckel (1866) - plants Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004) Phylum Rhodophyta Wettst. (1901) - red algae Subphylum Rhodellophytina Caval.-Sm. (1998) [monotypic] Class Rhodellophyceae Caval.-Sm. (1998) [paraphyletic?] Order Stylonematales K.M.Drew (1956) Genus Chroothece Hansgirg, in Wittrock & Nordst. (1884)