Common Names: Corrugated cap psathyrella
Cap is 3 to 10 cm; mostly convex at fist, expanding to broadly convex or flat; usually finely corrugated and wrinkled, especially in mature caps. Sometimes covered with fine fibers when young; dark reddish brown to brown, fading to brownish or tan; the margin typically hung with whitish partial veil remnants. Gills is attached to the stem. Pale brownish at first then becoming dark brown. Stem is 6 to 10 cm long, 0.5 to 1.5 cm thick, whitish; hollowing; smooth or finely silky; almost always lacking a true ring, but sometimes with loosely clinging partial veil remnants.
Can be found decomposing on dead hardwood logs and stumps, typically in summer and fall.