Agaricus butyraceus var. asemus Fr. Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Fungi phylum Basidiomycota class Agaricomycetes order Agaricales family Omphalotaceae genus Rhodocollybia species Rhodocollybia butyracea Name Homonyms Agaricus butyraceus var. asemus Fr. Agaricus butyraceus subsp. asemus Fr.