Agaricus micromegethus Pk. Cap 2.5-6cm across, convex with flattened disc; cream with darker innate fibrils, fibers dull yellowish brown to brown, staining stronger yellow when bruised. Gills free; white to grayish then dark brown. Stem 25-50 x 6-l0mm, equal; white staining yellowish; smooth above the ring, slightly fibrillose below; ring thin, single, often vanishing, white. Flesh white, discoloring yellowish. Odor pleasant. Taste pleasant. Spores ovoid to ellipsoid, 4.5-5.5 x 3.5-4µ. Deposit dark brown. Habitat in open pastures and meadows. Frequent. Found east of the Great Plains. Season July-September. Edible. Comment The collection illustrated was found in mixed woodlands in Oregon.