Paxillus involutus var. leptopus Fr. Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Fungi phylum Basidiomycota class Agaricomycetes order Boletales family Paxillaceae genus Paxillus species Paxillus filamentosus Name Homonyms Paxillus involutus var. leptopus Fr. Paxillus involutus var. leptopus (Fr.) Quél.