Macrolepiota procera (Scop.) Singer 1948

Lepiota procera (Scop.) S. F. Gray, Nat. Arr. Brit. PI. 1: 601
1821.
Agaricus procerus Scop. Fl. Cam. ed. 2. 2: 418. 1772.
Pileus soft, fleshy, ovoid to expanded, umbonate, solitary or gregarious, 8-16 cm. broad; surface radiate-fibrillose and rufescent beneath the cuticle, the cuticle thick, at first smooth and continuous, rufous to umber in color, at length torn asunder, except upon the umbo, into large irregular scales which become scattered and gradually fall away, margin deflexed, silkyfibrillose; context thick, soft, white; lamellae broad, close, white, at times yellowish or pinkish, tapering slightly behind, free, remote; spores ellipsoid or obovoid, apiculate, 1-2-guttulate, 12-18X8-12 m; stipe tall, tapering upward from the bulbous base, hollow or fibrous-stuffed, the cuticle thin, flocculose, rufous or brownish, at length drawn apart into minute scales, 15-25 cm. long, 8-16 mm. thick, the base 2-3 cm. thick; annulus thick, soft, subcoriaceous, movable, apical.
Type locality: Carniola.
Habitat: Meadows, pastures, and open woods. _
Distribution : New England to Alabama and west to Nebraska ; also in Europe.