This is helvella crispa Fr.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
It occurs in woods during the summer and autumn, and is known as the white helvella.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
It has been isolated from Amanita muscaria, A. pantherina, Boletus luridus, and helvella esculenta.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson