White, shaggy, cylindrical cap that turns black and inky. Often grows in large numbers along roadsides and in lawns and disturbed areas. September–October. Cap cylindrical, long, gradually expanding to bell-shaped; white, with flat white scales turning brownish; texture shaggy; with age, cap and gills become inky and liquefy. Gills narrow; spacing very crowded; white, becoming black and inky from the margin inward; attachment free. Stalk tall, straight, slightly bulbous at base; white; texture smooth. Spore print black. Spores magnified are elliptical, smooth, with small pore at tip.
Lookalikes: The green-spored lepiota (Chlorophyllum molybdites) has green spores and its cap is less cylindrical.