Ceramium rigens Shousboe ex C.Agardh Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Rhodomelaceae genus Dipterosiphonia species Dipterosiphonia rigens Name Homonyms Ceramium rigens Shousboe ex C.Agardh Ceramium rigens Shousboe