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