Clitocybe dilatata Pers. ex Karsten Cap 3-15cm across, convex becoming flat with a swollen umbo; an incurved margin becoming irregular, upturned, and wavy; often misshaped from overlapping; gray then whitish or chalky; dry, smooth, downy. Gills adnate to decurrent, close, narrow then broad; whitish to buff. Stem 50-125 x 5-20mm, solid becoming hollow, often curved, enlarged toward the base, which is often united with many others to form a large clump; white, bruising darker at base; finely felty and furrowed, sometimes minutely scaly toward the base. Flesh firm, thicker on the disc; watery gray to whitish. Odor none. Taste unpleasant. Spores ellipsoid, smooth, nonamyloid, 4.5-6.5 x 3-3.5ì. Deposit white. Habitat in groups or dense clusters, often overlapping, along roads or in sandy soil or gravel. Found in the Pacific Northwest and California. Also in Europe. Season May-November. Poisonous.