Agrocybe acericola (Pk.) Singer Cap 3-10m across, convex then flattened; dark yellow-brown then pale buff when dry; smooth, dry, hygrophanous. Gills adnate or with decurrent tooth, crowded; pale gray-brown. Stem 50-100 x 5-l0mm; pallid buff or whitish, with white threads at base; ring large, flaring, white. Flesh thin; white. Odor farinaceous. Taste farinaceous. Spores truncate, smooth, 8-10.5 x 5-6.5µ. Deposit dull rust-brown. Habitat on decaying logs and woody debris in hardwoods. Common. Found throughout North America. Season July-September. Not edible.