Key Features

Cap domed, umbrella-like, or wavy and spreading, the edge not attached to stalk. Cap yellow-brown to dark brown, smooth to somewhat wrinkled but not honeycombed with pits. Stalk with prominent ribs that extend up underside of cap nearly to edge. Stalk stained reddish, pinkish, or burgundy, at least at base. Growing on the ground. Other Features: Medium-sized to large; cap thin and fragile, much wider than stalk once it has unfurled. Flesh white or with a tinge of yellow.