Cosmarium formosulum var. nathorstii (Boldt) W. & G.S.West Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium formosulum Name Synonyms Cosmarium nathorstii Boldt, 1888 Homonyms Cosmarium formosulum var. nathorstii (Boldt) W. & G.S.West