Nitella opaca var. brachyclema J.Groves & Bull.-Webst. Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Charophyceae order Charales family Characeae genus Nitella species Nitella opaca Name Homonyms Nitella opaca var. brachyclema J.Groves & Bull.-Webst.