Cosmarium pyramidatum var. convexum Willi Krieg. & Gerloff, 1965 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium pyramidatum Name Homonyms Cosmarium pyramidatum var. convexum Willi Krieg. & Gerloff, 1965