=C. aborti´vus= B. and C.—abortive. (Plate LXIII, fig. 1, 2, 3, p. 254.) =Pileus= fleshy, firm, convex or nearly plane, regular or irregular, dry, _clothed with a minute silky tomentum_, becoming smooth with age, gray or grayish-brown. =Flesh= _white_, taste and odor subfarinaceous. =Gills= thin, close, slightly or deeply decurrent, at first whitish or pale gray, then flesh-colored. =Stem= nearly equal, solid, minutely flocculose, sometimes fibrous-striated, colored like or paler than the pileus. =Spores= irregular, 7.5–10×6.5µ. =Pileus= 2–4 in. broad. =Stem= 1.5–3 in. long, 3–6 lines thick. Ground and old prostrate trunks of trees in woods and open places. August and September. Our species has been found to be edible, but its flavor is scarcely as agreeable as that of some other species. _Peck_, 42d Rep. N.Y. State Bot. It requires longer cooking than C. prunulus, and is then quite equal in excellence. The fungus is so named because of the abortive form of it frequently found associated with it. This is faithfully portrayed on Plate LXIII. This is in every way similar to the aborted forms of C. prunulus and Armillaria mellea. Both forms plentiful near Philadelphia. The undeveloped masses are also similar to those of C. prunulus. The abortive form is a superior edible to the original. =C. popina´lis= Fr.—_popina_, a cook-shop. =Pileus= 1–2 in. across, flesh thin, flaccid, convex then depressed, somewhat wavy, glabrous, opaque, gray, spotted and marbled. =Flesh= grayish-white, unchangeable. =Gills= very decurrent, broader than the thickness of the flesh of the pileus, lanceolate, crowded, dark-gray, at length reddish from the spores. =Stem= stuffed, 1–2 in. long, 2 lines thick, equal, often flexuous, naked, paler than the pileus. =Spores= subglobose, slightly angular, 4–5µ _Massee_. Solitary or gregarious, smell pleasant like new meal, entirely gray. _Fries._ Woods. Gansevoort. July. The whole plant is of a grayish color except the mature gills, which have a flesh-colored hue, and the base of the stem, which is clothed with a white tomentum. It has a farinaceous odor. _Peck_, 51st Rep. N.Y. State Bot. Scattered. Mt. Gretna, Pa. September to November. _McIlvaine._ Edible, pleasant. =C. carneo-al´bus= Wither.—light flesh color. =Pileus= up to 1 in. across, convex then expanded, center becoming depressed and the margin drooping, even, polished, white, the disk becoming usually tinged with red. =Flesh= thin. =Gills= slightly decurrent, 1 line broad, crowded, salmon color. =Stem= 1–1½ in. long, 1 line thick, about equal, solid, white. =Spores= globose, nodulose, 7–8µ diameter. Inodorous; gregarious. In the section given in Cke. Illustr., the stem is represented as being distinctly hollow. _Massee._ New York, shaded ground. June. _Peck_, 45th Rep.