Cosmarium pachydermum var. hexagonum Gutw., 1890 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium pachydermum Name Synonyms Cosmarium deflandreanum Laporte Homonyms Cosmarium pachydermum var. hexagonum Gutw., 1890