Latin American Death Cap

The cap is convex to plano-convex, reaching dimensions of 3–11 centimetres (1+1⁄4–4+1⁄4 inches). The cap surface is sticky or tacky. The center of the cap is gray to brown with a gray edge. The white gills are closely crowded together and free from attachment to the stipe. In young mushrooms, the gills exude drops of clear fluid. The dry, white to pale grey stipe measures 8–20 cm (3–8 in) long by 0.5–1.7 cm (1⁄4–3⁄4 in) thick. It has a bulbous base, a white to grey, membranous volva at the stipe base, and white mycelium at the base. The stipe has a white ring. The odor of the flesh is mild to unpleasant. The spore print is white. Spores are smooth, amyloid, spherical or roughly so, and measure 7–10 by 6.8–9.5 μm. Clamp connections are absent from the hyphae.

Similar species. Amanita vaginata is similar, however A. vaginata has non-amyloid spores and lacks a ring on the stipe. It differs from A. phalloides (the death cap) in the colour of its cap.

A. arocheae is found in Mexico, Costa Rica, and Colombia. It is a mycorrhizal species that associates with oak as a host.