BRIEF DESCRIPTION: The following description is based on Gilbert (1941) and RET's examination of the original collection.

The cap of Amanita irreperta is 44 mm wide, slightly sordid-cream, becoming light buff, planar with a somewhat depressed center, with a striate margin.  The volva is present as easily removed scales over the center.

The gills are white, free, subdistant. The short gills are truncate to rounded-truncate, scattered, unevenly distributed.

The stem is 42 × 6 mm, exannulate, white, subcylindric. The volva is saccate, membranous, with two pronounced limbs, 30 × 20 mm, with limbs thin at top.

The spores measure (Gilbert, 1941) 10 x 6 µm and are ellipsoid. RET's spore measurements from the original collection are as follows: (7.6-) 8.0 - 10.3 (11.2) × (4.7-) 4.8 - 6.4 (-6.8) µm and are ellipsoid to elongate, infrequently cylindric and amyloid.

Originally described from Madagascar singly from a forest in sandy soil.