The Gyromitra esculenta Fr., is from 5–10 cm. high, and the cap from 5–7 cm. broad.
Atkinson, George Francis, Studies of American Fungi. Mushroom...(2010)
n a poisonous gyromitra; the surface of the fertile body is smooth at first and becomes progressively undulating and wrinkled (but never truly pitted); color varies from dull yellow to brown