=M. prolif´era= Sow.—_proles_, offspring; _fero_, to bear. (Plate X, figs. 6, 7, p. 28.) =Pileus= ⅔-1¼ in. across, slightly fleshy, expanded bell-shape, dry, the broad umbo darker (dingy-brown), slightly striate, and at length furrowed or rimosely split at the margin (pale yellowish or becoming brownish-tan). =Stem= 2½-3 in. long, firm, rigid, _smooth, shining, slightly striate_, rooted. Gills adnexed, somewhat distinct, becoming pale white. Inodorous, only at length nauseous. Very closely allied to M. galericulata, in habit approaching nearest to M. cohærens. The stems are pallid at the apex, but slightly tawny-bay-brown below, and glued together by hairy down at the base. There is a _white_ form with transparent stem—on trunks. _Fries._ Mt. Gretna, Pa. On ground in grass. Mycelium spreading on leaves. _McIlvaine._ Found in great plenty. Base of stems is sometimes white when in dense tufts. The whole plant is tender, cooking in fifteen minutes, and is of fine flavor. No one will want a better fungus. =M. rugo´sa= Fr.—_ruga_, a wrinkle. =Pileus= ash-color but becoming pale, very tough, slightly fleshy at the disk, otherwise membranaceous, bell-shaped then expanded, at length rather plane, somewhat obtuse, more or less corrugated (unequal with elevated wrinkles), always dry, not moist even in rainy weather, striate at the circumference. =Stem= commonly short, remarkably cartilaginous, tubed, rigid, tough, straight, at length compressed, even, smooth, pallid, with a short oblique hairy root. =Gills= _arcuato-adnate_, with a decurrent tooth, united behind in a collar, somewhat distant, connected by veins, broad, ventricose, white then gray, edge sometimes quite entire, sometimes with saw-like teeth. Always inodorous. Formerly connected with M. galericulata. M. rugosa is arid, very tough, more rarely cespitose, the pileus firm, somewhat obtuse, wrinkled but without striæ, the gills arcuato-adnate with a hooked tooth, _white then ash-color_. The genuine M. galericulata is fasciculato-cespitose, somewhat fragile, the pileus thinner, at first conical and umbonate, striate without wrinkles, the gills adnate, with a decurrent tooth, white then _flesh-color_. Between these there is a long series of intermediate forms. _Fries._ California, _H. and M._; Kansas, _Cragin_; Wisconsin, _Bundy_; New York, September, _Peck_, 46th Rep.; West Virginia, New Jersey, Pennsylvania. On decaying wood and ground near stumps. August to November. _McIlvaine._ The tenacity frequently occurring in Mycena is well shown in this species. The caps and stem cook tender, but it is better to discard the stems, as the two do not become tender at the same time.