Russula fragilis var. knauthii (Sing.) Kuhn. & Romagn. Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Fungi phylum Basidiomycota class Agaricomycetes order Russulales family Russulaceae genus Russula species Russula fragilis Name Homonyms Russula fragilis var. knauthii (Singer) Kuyper & Vuure Russula fragilis var. knauthii (Sing.) Kuhn. & Romagn.