Agaricus in old cowslung, partway, Dinkham 8 Sept. 1836. concreta. 3 & 4 together. Stems, semielliptical, obtuse, dusky brown, filmy and shining when dry, margin subacuminate, subumbilicate. Gills elliptical, acute at each end, adnexed, 1 or a lot, concolorous, spicular black. Stem elongated slender, fistulose, concolorous with the pileus. Pileus 2 to 1/2 inches broad and high, semiovate or semielliptical, with minute longitudinal depressions, pale when dry. Gills a pale watery brown but at length affixing caused with a black powder, which is formed of the spicular black threads. Stem 3-5 inches long, slender, minutely fibrous above, somewhat enlarged at the base where are several radicles, also a straw-white down. Flesh fleshy any. Odour faint of the A. campestris.