Pleurotaeniopsis ralfsii (Bréb. ex Ralfs) De Toni, 1889 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium ralfsii Name Homonyms Pleurotaeniopsis ralfsii (Bréb. ex Ralfs) De Toni, 1889