Cosmarium transitorium (Heimerl) Ducellier Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Cosmarium species Cosmarium transitorium Name Synonyms Cosmarium pachydermum f. transitorium Heimerl, 1991 Homonyms Cosmarium transitorium (Heimerl) Ducellier