Claim: Gymnopilus rigidus is a species of mushroom or fungus named by mycologist Murrill and is from the order Agaricales and the family Cortinariaceae from the kingdom Fungi.
Evidence: Gymnopilus rigidus is a species of mushroom in the family Cortinariaceae. It was given its current name by American mycologist Murrill in 1917. Kingdom: Fungi Order: Agaricales