Ceramium rubrum f. tenue J.Agardh, 1876 Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Ceramiaceae genus Ceramium species Ceramium tenue Name Homonyms Ceramium rubrum f. tenue J.Agardh, 1876 Ceramium rubrum var. tenue C.Agardh, 1824