=A. argen´teus= Brændle—of silver. =Pileus= thin, convex becoming nearly plane, slightly silky or glabrous, pale grayish white or grayish brown, shining with a silvery luster when dry, the margin sometimes striate, at first incurved, often revolute when old. =Flesh= whitish, becoming blackish where cut. =Lamellæ= close, free, at first brownish becoming blackish brown or black with age. =Stem= short, glabrous, solid, often narrowed toward the base, the annulus slight, evanescent. =Spores= broadly elliptic, 7–10µ long, 6µ broad. =Pileus= 1–2 in. broad. =Stem= 1–1½ in. long, ¼-⅜ in. thick. Lawns and grassy places in rich soil. Often associated with Stropharia bilamellata Pk. After rains from April to November. Washington, D.C. _F.J. Brændle._ This is a small mushroom, peculiar in having the young gills of a dark color and in the absence of any pink hues. The gills sometimes become moist and manifest a tendency to deliquesce. The drying specimens emit a strong but not unpleasant odor. Mr. Brændle says that their edible quality is excellent and that it is not impaired by drying. _Peck_, Bull. Torr. Bot. Club, Vol. 26, F. 1899. =A. praten´sis= Schaeff.—a meadow. =Pileus= 2–3½ in. across, ovoid then expanded, becoming smooth or sometimes broken up into scales more or less concentrically arranged, whitish, then grayish. =Flesh= thick in the center, thin toward the margin, white. =Gills= free, rounded behind, about ¼ in. broad, grayish, then brown. =Stem= about 2 in. long, ½-⅔ in. thick, base thickened, smooth, whitish. =Ring= median, simple, usually deciduous. =Stem= becoming more or less hollow. =Spores= elliptical, apiculate, 6×3.5µ. On pastures and woods. Distinguished by the grayish gills becoming brown without any intermediate pink or fleshy tinge, and in being rounded behind, the median deciduous ring, and the more or less hollow stem. _Massee._ California. Common. Edible. _H. and M._ Not elsewhere reported. =A. achi´menes= B. and C. _Gr_—an amber-colored plant. =Pileus= 4–6 in. broad, pallid or yellowish-white, smooth like kid leather, but studded with warty excrescences especially toward the center. =Stem= 4–6 in. high, 3–4 lines thick, white, stuffed with floccose fibers, furnished toward the apex with a large deflexed ring. =Gills= broad, crowded at first, whitish then ash-colored and dingy-brown, free. =Spores= brownish, oval or ovate. A splendid species allied to A. fabaceus, but differing in its paler spores, warty cap, ample ring, etc. On the earth. Solitary. June. _S.C. Ravenel._ Am. Jour. Sci. and Arts, 1849. I have not seen this species.