Agaricus pocillator Murr. Cap 3-10cm across, convex to flattened at disc; white with minute blackish-gray scales, darker at disc. Gills free; white to pinkish then dark brown. Stem 40-80 x 6-12mm, equal with a distinct, often marginate, small bulb at base; white; smooth above and below ring; ring large, of two distinct layers, membranous. Flesh white, yellowing slightly in stem base. Odor not distinctive. Taste not distinctive. Spores ellipsoid, 4.5-6 x 3-3.8µ. Deposit deep brown. Habitat often in large numbers in mixed woods. Found in southeastern and eastern North America. Season July-August. Not edible.