Clitocybe dealbata (Sweating Mushroom)

Description: Small, smooth, dull white mushroom with gills slightly descending stalk; in grass and open woods.

Cap: 3/8-1 5/8" (1-4 cm) wide; convex to flat, then sunken; margin incurved, then wavy and upturned; dry, smooth, white, then grayish to pinkish.

Gills: attached or slightly descending stalk; close, narrow, white.

Stalk: 1-2" (2.5-5 cm) long, 1/16-1/4" (1.5-5 mm) thick; smooth, fibrous-tough, white.

Spores: 5-6 X 3-4 m; broadly elliptical, smooth, colorless. Spore print white.

Edibility: Poisonous.

Season: July to September; November-February in California.

Habitat: Scattered to numerous, on the ground in grass and in open woods.

Range: Widely distributed in North america.

Look-alikes: Several small, whitish Clitocybes are similar and not easily differentiated by field characteristics. C. dilatata is larger, grows in clusters in West. Marasmius oreades is buff, with distant, nearly free gills and rubbery stalk.

Comments: This little white mushroom often grows near Fairy Ring Mushrooms (Marasmius oreades) and is picked along wit them by mistake. It contains the toxin muscarine, which causes transient, mild to severe poisoning, including perspiration, chills, and tunnel vision.

Clitocybe dealbata images and excerpt from Gary H. Lincoff's National Audubon Society Field Guide to North American Mushrooms, (1981/2004, pp. 745-746 , images #241, 245).

Clitocybe dealbata (Sweating Mushroom)
Clitocybe dealbata (Sweating Mushroom)2