Cosmarium margaritiferum var. kirchneri (Børgesen) Föster Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium kirchneri Name Homonyms Cosmarium margaritiferum f. kirchneri (Børgesen) West & G.S.West, 1908 Cosmarium margaritiferum var. kirchneri (Børgesen) Föster