Polysiphonia flexicaulis Harvey Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Ceramiales family Rhodomelaceae genus Polysiphonia species Polysiphonia flexicaulis Name Homonyms Polysiphonia flexicaulis (Harvey) F.S.Collins Polysiphonia flexicaulis Harvey