Kingdom Plantae Haeckel (1866) - plants Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004) Phylum Rhodophyta Wettst. (1901) - red algae Subphylum Rhodellophytina Caval.-Sm. (1998) [monotypic] 1 Class Rhodellophyceae Caval.-Sm. (1998) [paraphyletic?]