Claim: Gymnopilus ludovicianus is in the Cortinariaceae (a large family of gilled mushrooms), within the Agaricales order, under the Agaricomycetes class.
Evidence: Gymnopilus ludovicianus is a species of mushroom in the family Cortinariaceae. Agaricales Order: Agaricomycetes Class: The Cortinariaceae are a large family of gilled mushrooms found worldwide, containing over 2100 species. 
The Cortinariaceae are a large family of gilled mushrooms found worldwide, containing over 2100 species. Agaricales Order: Agaricomycetes Class: Cortinariaceae Family: