Polysiphonia obscura Harvey, 1855 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Rhodomelaceae genus Ophidocladus species Ophidocladus simpliciusculus Name Homonyms Polysiphonia obscura Harvey, 1855 Polysiphonia obscura (C.Agardh) Falkenb. Polysiphonia obscura (C.Agardh) J.Agardh