Kingdom Plantae Haeckel (1866) - plants Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004) Phylum Rhodophyta Wettst. (1901) - red algae Subphylum Eurhodophytina G.W.Saunders & Hommers. (2004) Class Florideophyceae Cronquist (1960) Subclass Hildenbrandiophycidae G.W.Saunders & Hommers. (2004) [monotypic] 1 Order Hildenbrandiales Pueschel & K.M.Cole (1982)