BRIEF DESCRIPTION: The cap of Amanita mafingensis is 40 - 130 mm wide, convex, then planar, often with a slight umbo, silky smooth, sticky, sometimes appendiculate with a bit of the partial veil, with striate margin (10^±% of the radius); it's cap is copper-brown to chestnut, often with a darker ring near the inner ends of marginal striations. The flesh is firm, white for the most part, and yellow under the cap skin.  The volva is absent.

The gills are free with decurrent striations on stem apex, fairly crowded, ivory to yellow, fairly thin, and have a smooth edge.

The stem is 50 - 110 x 10 - 20 mm, very pale yellow to yellow, with white, hollow, brittle-fibrous flesh.  The robust, saccate volva is white to grayish on the exterior surface, membranous, thick, and lobed.

The spores measure 10.5 - 12.7 (-15.8) x (6.8-) 7.1 - 8.9 (-10.5) µm and are ellipsoid to elongate and inamyloid.  Clamps are infrequent at bases of basidia.

Amanita mafingensis was originally described from Tanzania.  The species is fairly widely distributed in miombo woodlands in central Africa.