BRIEF DESCRIPTION: All information is taken from Corner and Bas (1962).  The cap of A. xanthella is 20 - 45 mm wide, shallow concave with a flat margin, pale yellow, deeper yellow in the center, dry, with a tuberculate-striate margin.  The cap is set with small, mealy, bright yellow, pyramidal warts crowded in the center, and scattered and smaller toward the margin.

The gills are free, crowded, thin, white, with a very pale yellow, entire edge.

The stem is 30 - 60 x 2 - 4 mm, solid, becoming hollow, white, and slightly fibrillose-floccose.  The base is set with small, yellow, mealy flocks as volval remnants.

According to the original description (1962), spores from dried material measure 6.5 - 7.4 (-8.1) x 5.1 - 7.1 µm (from fresh, 7 - 9 µm wide) and are subglobose to broadly ellipsoid and amyloid.  Clamps were not observed at the bases of basidia.

This species was described from Singapore.

The striate margin is unusual in Amanita sect. Validae, but there are some tropical species (especially small, delicate ones) that have this character.  Small taxa in sect. Validae with friable yellow volvas are listed for purposes of comparison under A. flavoconia G. F. Atk. var. flavoconia. -- R. E. Tulloss