Cosmarium hammeri var. croasdale Willi Krieg. & Gerloff, 1962 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium hammeri Name Homonyms Cosmarium hammeri var. croasdale Willi Krieg. & Gerloff, 1962