Syn. Leucocoprinus cepistipes. This little lepiota can be recognized by its powdery white cap, its lined margin, and its habitat in cultivated areas, especially on wood chips. Cap is 2 to 8 cm, oval when young, becoming broadly conical or bell-shaped or nearly flat; dry; powdery with soft, white granules; sometimes becoming scaly in age; white to pale pink, often with a darker, yellowish or brownish center; the margin distinctly lined. Gills are free from the stem; white; crowded. Stem is 4 to 14 cm long; 3 to 6 mm thick; more or less equal, but frequently swollen in places (reminiscent of scallions; the Latin name means 'onion-stalked' and refers to the shape rather than the texture or color); with a swollen base; smooth or with white powder; often discoloring yellowish to brownish and/or bruising these shades; with a white ring on the upper stem that is fairly persistent but easily removed. Flesh is white; very thin; sometimes bruising or discoloring yellowish to brownish.
Can be found growing in groups or clusters in wood chips, cultivated soil, and gardens. Rarely found in woods.