Closterium ulna G.W.Focke, 1847 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Zygnematophyceae order Zygnematales family Closteriaceae genus Closterium species Closterium directum Name Homonyms Closterium ulna Focke ex W.B.Turner, 1892 Closterium ulna G.W.Focke, 1847