Cosmarium margaritiferum f. kirchneri (Børgesen) West & G.S.West, 1908 Dataset GBIF Backbone Taxonomy Rank FORM 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