Cosmarium holmiense f. constrictum Gutw., 1890 Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium holmiense Name Homonyms Cosmarium holmiense f. constrictum Gutw., 1890 Cosmarium holmiense var. constrictum (Gutw.) Willi Krieger & Gerloff, 1965