Callithamnion seminudum C.Agardh, 1828 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Wrangeliaceae genus Pleonosporium species Pleonosporium borreri Name Homonyms Callithamnion seminudum C.Agardh, 1828