Tricholoma vernaticum

Tricholoma vernaticum is an agaric fungus of the genus Tricholoma. It was originally described in 1976 as a species of Armillaria when that genus was more inclusive; it received its current name twenty years later. The stout fruit bodies (mushrooms) have moist white to grayish caps (later becoming grayish-brown with age), a membranous ring on the stipe, and an odor resembling cucumbers. The species is native to the Pacific Northwest region of the United States. Mycorrhizal with conifers, it fruits in the spring or early summer, appearing on the ground singly or in groups at high elevations, often at the edge of melting snowbanks. The edibility of the mushroom is unknown, but it has an unpleasant odor and a mealy taste. ...read more on Wikipedia.