Ceramium gracillimum var. byssoideum Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Ceramiaceae genus Ceramium species Ceramium gracillimum Name Homonyms Ceramium gracillimum var. byssoideum Ceramium gracillimum subsp. byssoideum Mazoyer, 1938