- a deadly poisonous mushroom of the genus Amanita, especially A. phalloides, with a distinctive membranous cup around the base of the stalk. Death caps resemble a number of edible mushrooms and are responsible for more deaths than any other species of mushroom.
- a poisonous woodland saprotrophic basidiomycetous fungus, Amanita phalloides, differing from the edible mushroom (Agaricus) only in its white gills (pinkish-brown in Agaricus) and the presence of a volva
