Closterium jenneri var. robustum Ralfs Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Zygnematophyceae order Zygnematales family Closteriaceae genus Closterium species Closterium jenneri Name Homonyms Closterium jenneri var. robustum West Closterium jenneri var. robustum Ralfs