BRIEF DESCRIPTION: The cap of Amanita supravolvata is 25 - 85 (-90) mm wide, hemispherical, then pulvinate to plano-convex, rarely bluntly umbonate, with a decurved, short striate or short sulcate margin (10^±% of the radius). The cap is pale gray. The flesh is white and pearly. The volva is absent or present as a small to large white cottony, membranous patch over the cap center.

The gills are free, rather close, whitish cream, with some flesh tones at first, up to 8 mm wide, and proportionately rather thick. The short gills are scattered and truncate at a right angle.

The stem is 90 - 185 x 6 - 17 mm, very white, very slender, narrowing upward and expanding at the apex, and exannulate. The flesh is white, pearly, stuffed, then hollow. The saccate volva has its highest point 35 - 67 mm from the stem base; it stands out evenly from the stem for the upper 15 - 35 mm, and abruptly becomes appressed to the stem below this part.

The spores measure (8.8-) 9.8 - 13.5 (-16.5) x (6.4-) 7.3 - 10.5 (-14.0) µm and are broadly ellipsoid to ellipsoid (infrequently subglobose or elongate) and inamyloid.  Clamps are occasionally observed at bases of the basidia.

Amanita supravolvata was originally described from beaches of the Atlantic Coast of France (Dép. Gironde). It has also been found in sandy soils in Germany and Poland. Pines are apparently associated with A. supravolvata.

For links to related species see Amanita mairei Foley. -- R. E. Tulloss