Cosmarium subcostatum W. & G.S.West Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Zygnematophyceae order Zygnematales family Desmidiaceae genus Cosmarium species Cosmarium subcostatum Name Homonyms Cosmarium subcostatum Nordst. Cosmarium subcostatum W. & G.S.West