Lepiota cristata, commonly known as the Stinking Dapperling, is a small agaric mushroom recognised by its reddish-brown, scaly cap and unpleasant odour reminiscent of rubber or rotting vegetables. It is typically found growing singly or in groups on soil in grassy areas, woodland edges, and sometimes in parks or gardens, particularly in late summer and autumn.

Cap reddish-brown, breaking up into minute, pointed scales and revealing whitish flesh beneath. It is conical or convex and often has a noticeable umbo. The flesh is white, becomes slightly brown with age, and is thin and fragile. Gills free from the stem, close together, with frequent short gills. Colour ranges from white to buff. Stem more or less equal in width, smooth, and fragile. Whitish in colour, often turning pinkish to brownish towards the base. A delicate white ring is usually present on the upper portion, though it may easily disappear. The base is covered with white mycelium. Spore print white.

Microscopic Features: Spores very distinctively shaped, resembling a rowing boat from above or a bullet in profile. They are smooth, measure 5–8 × 3–5 µm, and are dextrinoid.

Lepiota cristata on the First Nature Web site.
Lepiota cristata on the MushroomExpert.Com Web site.

The second photo is by Huafang under the Attribution-ShareAlike 3.0 Unported license.