Antithamnion cruciatum f. tenuissima Hauck, 1883 Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Ceramiaceae genus Antithamnion species Antithamnion villosum Name Homonyms Antithamnion cruciatum f. tenuissima Hauck, 1883