Staurastrum contortum var. pseudotetracerum Nordst., 1887 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Plantae phylum Charophyta class Conjugatophyceae order Desmidiales genus Staurastrum species Staurastrum pseudotetracerum Name Homonyms Staurastrum contortum var. pseudotetracerum Nordst., 1887 Staurastrum contortum subsp. pseudotetracerum Nordstedt