The cap of Amanita manginiana is around 50–80 mm (5–8 cm) wide, chestnut brown, darker in the center, with the margin more pallid, silky (bearing fine hairs), convex then applanate, fleshy, and has a nonstriate margin. The gills are adnate and white. Short gills are present. The stipe is around 50–80 mm (5–8 cm) high, cylindrical, stuffed, white, becoming orangish-brown. The bulb is fleshy, globose to ovoid. The ring is membranous, white, superior, skirt-like. The volva is membranous, limbate, and fulvous-white. The spores measure 7 - 8 × 6 µm and are ovoid to subglobose. Its spores have a length of around 9.2 - 10.3 µm and a width of 7.5 - 7.8 µm. The spores are nothing but amyloid rubble and the collected specimens are unfortunately, almost entirely useless.
