Cosmarium hammeri subsp. protuberans W. & G.S.West Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium hammeri Name Homonyms Cosmarium hammeri var. protuberans West & G.S.West Cosmarium hammeri subsp. protuberans W. & G.S.West