Polysiphonia atricapilla J.Agardh, 1863 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Rhodomelaceae genus Polysiphonia species Polysiphonia atricapilla Name Homonyms Polysiphonia atricapilla J.Agardh, 1863