P. immi´tis Pk.—wide, rude. Pilei cespitose-imbricated, broad, slightly convex or flattened, more or less rough or uneven, radiately-wrinkled, tuberculose or fibrous-bristled, zoneless, white, becoming tinged with yellow or alutaceous in drying. Flesh white, slightly fibrous, soft and moist when fresh, cheesy when dry, with a subacid odor. Pores minute, angular or even subflexuous, about equal in length to the thickness of the pileus, the dissepiments thin, white, often at length dentate or lacerate on the edge. Spores minute, white, elliptical, 3–4×18–20µ.
Pilei 2–4 in. broad, the flesh commonly 3–4 lines thick.
Decaying ash trunks. East Berne. August.
The species is apparently related to P. cæsareus, but the character of the pores is quite different in the two species. Peck, 35th Rep. N.Y. State Bot.
Mt. Gretna, Pa. On dead black oak. August to November, 1898.
Several clusters grew on dead black oaks. The pilei overlap and the wrinkled corrugated margins curve downward, giving them the semblance of shells. From a distance a group looks like Pleurotus ostreatus. The substance is juicy; while cooking it is at first bitter, but this disappears. It becomes tender and well flavored.
P. alliga´tus Fr.—alligo, to bind to. In many cespitose layers, fibrous-fleshy, rigid-fragile. Pilei tan-isabelline, imbricated, unequal, zoneless, villous. Pores minute, soft, white, readily becoming stopped up with flocci.
Often clavate when young. Commonly wrapping round stipules and grasses. Fries.
Spores elliptical, pale, 6×7µ Massee.
Woodland Cemetery, Philadelphia. Among oak trees on grassy ground. July, August, September. McIlvaine.