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