Amanita alba, is an edible mushroom in the Amanitaceae family of fungi. Unlike many other Amanita mushrooms, Amanita alba lacks a ring on the stem. The cap is white, 5 to 10 centimetres (2.0 to 3.9 in) in diameter, and has furrows around the edge that duplicate the gill pattern underneath. It has a widespread distribution in North America, and is thought to be part of a species complex that includes other similar-looking Amanitas.
The cap is 3 to 10 centimetres (1.2 to 3.9 in) in diameter and white color; initially the cap is oval, then as it matures it becomes progressively conical, convex, and eventually flattened, sometimes with a small umbo (a rounded elevation in the center of the cap). The gills are white, free (not attached to the stem) to narrowly attached, moderately crowded together, the lamellulae (small gills that run from the edge of the cap towards the stem) are truncate. The flesh is white and thin, and does not change color upon bruising or injury. The stem is 8 to 22 centimetres (3.1 to 8.7 in) long and 1 to 2 centimetres (0.4 to 0.8 in) thick. Unlike many other Amanitas with stems that are swollen at the base (bulbous), the thickness of the Amanita alba stem is roughly the same at both ends. The stem surface is covered with a finely powdered bloom (pruinose), especially near the top; faint longitudinal lines may be seen. The base of the stem is enlosed in a loose, sack-like volva. The spore print is white.
The spores are roughly spherical, 8–12 µm in diameter, thin-walled, and nonamyloid (that is, not absorbing iodine stain in Melzer's reagent). The pileipellis (cap cuticle) is composed of filamentous interwoven hyphae, 2–7 µm diameter, gelatinized. The spore-bearing cells, the basidia, are 36–52 by 4–13 µm, 4–sterigmate, without clamps. The volva is largely made of filamentous hyphae, 2–8 µm diameter, inflated cells broadly elliptic, elliptical, fusiform, to clavate, 40–85 by 10–35 µm, mostly terminal. The stem tissue is made up of filamentous hyphae with diameters of 2–6 µm; the inflated cells are terminal, club-shaped, longitudinally oriented, with dimensions of up to 289 by 31 µm.
A mycorrhizal species, Amanita alba grows singly or numerous in both coniferous and hardwood forests. It has also been noted to occur frequently in grassy areas at the edge of forests, unkempt lawns, and suburban area where the ground has been recently disturbed. A widely distributed and common species, it fruits from the spring to the fall.