Spondylosium pygmaeum (Cooke) W.West Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Spondylosium species Spondylosium pygmaeum Name Homonyms Spondylosium pygmaeum (Cooke) W.West Spondylosium pygmaeum Cooke