Nomenclatural Citations/Agaricus/albo-flavidus

Original description (English)
Pileus at first convex, with the margin incurved, then expanded, or slightly depressed, moist, smooth, even white, in exposed places becoming yellowish; gills close, narrow, thin, emarginate and decurrent with a tooth; stem whitish, equal, solid, striato-fibrillose, with a thin tough cuticle. Ground in woods and open fields. Sandlake and North Elba. August. Height 3-4 in.; breadth of pileus 2-3 in.; stem about 3 lines thick. The pileus is sometimes slightly and broadly umbonate.