P. retiru´gis Fr.—rete, a net; ruga, a wrinkle. Pileus about 1 in. across, at first almost globose, then hemispherical, subumbonate, minutely mealy, opaque, moist, furnished with uniting raised ribs, pinkish tan-color; margin with irregular fragments of the veil attached. Flesh rather thick. Gills adnexed, ascending, 2 lines or more broad, grayish-black. Stem 2–4 in. long, about 2 lines thick, equal, pruinose, purplish flesh-color, hollow. Fries.
Spores elliptic-fusiform, 11–13×7µ Massee.
On dung. Distinguished among the species of Panæolus by the raised ribs on the pileus and its appendiculate margin. The pileus is sometimes grayish. Closely resembling, superficially, Psathyra corrugis, which is, however, distinguished by the violet-black gills.
Spores elliptical, shortly fusiform, 20µ Q.; 16×11µ W.G.S.
New York, Peck, 23d Rep. West Virginia, 1881–1885. Pennsylvania, New Jersey, frequent on dung. June to frost. McIlvaine.
P. retirugis is not a common species, and is a sparse grower, but is frequently found. It is seldom that a mess can be had at one time. It is an excellent species by itself and imparts a good flavor to others.
P. fimi´cola Fr.—fimus, dung; cola, to inhabit. Pileus ½-¾ in. across and high, slightly fleshy, convex bell-shaped, obtuse, glabrous, opaque, dingy-gray when moist, paler and yellowish when dry, with a narrow brown encircling zone near the margin. Gills adnate, 2 lines or more broad, gray, variegated with smoky-black. Stem 2–4 in. high, 1 line or more thick, equal, fragile, whitish, powdered with white meal upward, hollow. Fries.
Stem soft, fragile, obsoletely silky-striatulate, 2–4 in. long. Pileus when moist commonly smoky-gray, when dry grayish clay-color, sometimes discoid. Gills semi-ovate with a minute decurrent tooth. Fries.
West Virginia, Pennsylvania, New Jersey. Frequent. On dung and richly manured places. June to September. McIlvaine.
P. fimicola is neither as large nor heavy as P. solidipes, but in other respects equals it.