Ceramium fastigiatum subsp. flaccidum H.E.Petersen Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Ceramiaceae genus Ceramium species Ceramium cimbricum Name Homonyms Ceramium fastigiatum var. flaccidum Ceramium fastigiatum subsp. flaccidum H.E.Petersen Ceramium fastigiatum f. flaccidum H.E.Petersen, 1918