=P. spathula´tus= Pers.—shaped like a spathula. =Pileus= rather thin, 1–2 in. broad, ascending, spathulate, tapering behind into the stem, glabrous, convex or depressed on the disk and there sometimes pubescent, alutaceous or brownish tinged with gray, red or yellow. =Gills= crowded, linear, decurrent, whitish or yellowish. =Stem= compressed, sometimes channeled above, grayish-tomentose. =Spores= elliptical, 7.6×4–5µ broad; odor and taste farinaceous. Ground. Sandlake. June. Edible. It grows singly or in tufts and is an inch or more in height. The margin is thin and sometimes striatulate and reflexed. Toward the base the flesh is thicker than the breadth of the gills. The cuticle is tough and separable. The flesh is said by Gillet to be tender and delicate. Persoon describes the disk as spongy-squamulose, but in our specimens it is merely pubescent or tomentose. _Peck_, 39th Rep. N.Y. State Bot. Recorded as edible by Professor Peck. At Eagle’s Mere, Pa., I found many specimens agreeing with this description. They grew from decaying wood under ground, yet had the appearance of growing from the earth. It is probable that others have been deceived. In quality I found this to be one of the best. =P. sero´tinus= Fr.—late. =Pileus= fleshy, 1–3 in. broad, compact, convex or nearly plane, viscid when young and moist, dimidiate kidney-shaped or suborbicular, solitary or cespitose and imbricated, variously colored, dingy-yellow, reddish-brown, greenish-brown or olivaceous, the margin at first involute. =Gills= close, determinate, whitish or yellowish. =Stem= very short, lateral, thick, yellowish beneath and minutely tomentose or squamulose with blackish points. =Spores= minute, elliptical, 5µ long, 2.5µ broad. Dead trunks of deciduous trees. _Peck_, 39th Rep. N.Y. State Bot. Mt. Gretna, Pa., 1887, and at Mt. Moriah, near Philadelphia, from August until November, 1898. Upon these findings the pileus was tomentose at base, as was the short stem. The species is not noticeably viscid after its youth. The viscidity can be detected in old specimens by moistening the pileus. Its flavor is not marked, nor is its texture as pleasing as most others of its genus, but being a late species it satisfies the longing of the mycophagist for his accustomed food. =P. pulmona´rius= Fr.—_pulmo_, lung, from texture. =Pileus= 2–3 in. broad, _ash-colored_, continuous with the stem, fleshy, soft, but tough, _flaccid_, _obovate_ or kidney-shaped, plane or reflexo-conchate at the margin, even, _smooth_. =Flesh= thin, soft, white. =Stem= very short, solid, exactly lateral, _horizontal_ or ascending, _round_, _villous_, expanded into the pileus. =Gills= decurrent but _ending determinately_, _moderately broad_, distinct, not branched or anastomosing at the base, livid or _ash-color_. The primary form is solitary. The pileus is ashy-tan when dried. It differs from A. salignus alike in the definitely lateral stem and in the thin flaccid pileus. _Fries._