BRIEF DESCRIPTION: The cap of A. gemmata is 50 - 100 mm wide, oval to hemispherical at first, then convex to plano-convex, finally slightly depressed at the center, moderately grayish yellow to light yellow, with a somewhat darker center, viscid when moist, glabrous, with a tuberculate-striate margin. The cap is scattered with soft, moderately thick to thin floccose patches or warts, variable in size medium to small.

The gills are free to remote, whitish to pale cream, and broadest near the middle. The short gills are truncate.

The stem is up to 110 x 10 mm, gradually tapering upward, stuffed then hollow, white, with cracked to appressed scaly belts. The volva is present s appressed scales or small floccose warts near the apex of the bulb.

The spores measure 8 - 10 x 6.5 - 7.5 µm and are inamyloid and ellipsoid to broadly ellipsoid. Clamps are infrequently present at bases of basidia.