Closterium angustatum Kuetz. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Zygnematophyceae order Zygnematales family Closteriaceae genus Closterium species Closterium angustatum Name Homonyms Closterium angustatum Kütz. ex Ralfs Closterium angustatum Kuetz.