Monostroma oxyspermum f. orbiculatum (Thur.) Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Chlorophyta class Ulvophyceae order Ulvales family Gayraliaceae genus Gayralia species Gayralia oxysperma Name Homonyms Monostroma oxyspermum f. orbiculatum (Thur.) Monostroma oxyspermum subsp. orbiculatum (Thuret)