Guangzhou destroying angel

A species of Amanita mushrooms

The cap is 4–7 cm (1.6–2.8 in) in diameter, initially egg-shaped, then convex but flattening with age, and sometimes slightly depressed at the center. The cap surface is smooth, white, but cream-colored in the center. The margin (cap edge) is non-striate, non-appendiculate (without any partial veil remnants hanging along the cap margin); the flesh white. The gills are free from attachment to the stem, white to whitish, crowded closely together, and up to 5 mm in height. The lamellulae are long and tapering, plentiful, and arranged in 2–3 tiers. The stem is 7–9 cm (2.8–3.5 in) by 0.5–1 cm (0.2–0.4 in), roughly cylindrical or slightly tapering upward, with apex slightly expanded. The surface is white to whitish, smooth, or sometimes with fibrous small scales. The bulb at the base of the stem is roughly spherical and 1–2 cm (0.4–0.8 in) wide. The volva is limbate (has a distinct edge), thin, membranous, with free limb up to 7 mm in height, and both surfaces are white. The ring is near the top of the stem, thin, membranous, white, persistent or may be torn from the stem during expansion of the cap. All tissues of the fruit body will turn yellow if a drop of dilute potassium hydroxide is applied. The spores are spherical or nearly so, rarely broadly ellipsoid, and measure 9.5–12 by 9–11.5 µm. They are hyaline (translucent) and colorless, amyloid (absorbing iodine when stained with Melzer's reagent), thin-walled, smooth, and have a small apiculus. The spore-bearing cells, the basidia, are 27–55 by 10–15 µm, club-shaped, and two-spored (rarely one-spored). They have sterigmata (slender projections that attach the spores) that are 5–7 µm long.