Amanita nigrescens, commonly known as blackening amanita, is a species of fungus in the Amanita genus. It has some similarities to Amanita pekeoides.
Amanita nigrescens has a moist, waxy cap with dark-brown warts. It has white gills that are free from the stem. It has white spores and a blackish-brown ring. It has a white volva with yellow-brown tints.
Amanita nigrescens is found in New Zealand and grows under Nothofagus trees.