BRIEF DESCRIPTION: The cap of Amanita pegleri is 40 - 50 mm wide, conico-convex to plano-convex to planar, white to whitish ochraceous, dry, with a nonstriate and appendiculate margin.  The volva is present as dense covering of small, granulose to pyramidal warts.  The flesh is white and soft.

Gills are adnexed to free but not distant from the stem, subcrowded, very pale ochraceous, sometimes with pinkish tints, 4 - 5 mm broad.  The short gills are of diverse lengths, with the shorter ones truncate and longer ones attenuate.

The stem is 70 - 80 × 4 - 8 mm, pure white, and cylindric.  There is no bulb on the stem, but the stem base is deeply inserted (30 mm more) into the soil.  The ring is white, superior, narrow, thin, membranous, fragile, loosely attached to stem, with a toothed margin.  The volva only appears as scattered, fibrillose squamules, white. The flesh is solid.

The odor is not distinctive when fresh and is sweet and unpleasant like dried specimens of Amanita nauseosa (Wakef.) D. A. Reid in dried material.

The spores measure (6.2-) 6.3 - 8.8 (-11.2) × (5.0-) 5.4 - 7.1 (-8.4) µm and are subglobose to broadly ellipsoid to ellipsoid and amyloid.  Clamps are present at bases of basidia.

This species is known only from Martinique in "secondary mesophytic forest."