Staurastrum pygmaeum Brebisson Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Staurastrum species Staurastrum pygmaeum Name Homonyms Staurastrum pygmaeum Brebisson Staurastrum pygmaeum Bréb. ex Ralfs, 1848