Callithamnion irregulare J.Agardh, 1841 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Wrangeliaceae genus Spermothamnion species Spermothamnion irregulare Name Homonyms Callithamnion irregulare J.Agardh, 1841