Claim: Gymnopilus nitens, a species of mushroom with a convex cap, is in the Cortinariaceae family, Agaricales order, Agaricomycetes class, Basidiomycota division and Fungi kingdom.
Evidence: Gymnopilus nitens is a species of mushroom in the family Cortinariaceae. cap is convex Family: Cortinariaceae Order: Agaricales Class: Agaricomycetes Division: Basidiomycota Kingdom: Fungi