BRIEF DESCRIPTION: The following description is base on Gilbert (1941) and the notes with the type collection.

The cap of Amanita murinacea is 70 - 80 mm wide, dry, silky, mouse-gray, plano-convex, with a smooth margin.  Volval remnants are absent.

The gills are crowded, free, white.

The stem is 95 × 13 mm, cylindric, narrowing upward, with a bulbous base.  The ring is rather narrow, white, striate above, skirt-like.  The volva is membranous, limbate.  The bulb is ovoid and 30 x 20 mm, white, tends to turn fulvous.

The spores measure 7 - 8 × 6 - 7 µm and are subglobose and amyloid.  Gilbert's (1941) drawings of spores sometimes do not match the information provided in his descriptions.  Measuring the spore drawings yields a length of 7.8 - 8.5 µm. Very few spores are positioned in side view and these show the widths to be 7 - 8.3 µm.  Basidia probably lacking clamps because of its assigned section.

Originally described from Madagascar, Africa in sandy soil.