Description
A. ocreata is generally stouter than the other fungi termed destroying angels. It first appears as a white egg-shaped object covered with a universal veil. As it grows, the mushroom breaks free, though there may rarely be ragged patches of veil left at the cap edges. The cap is initially hemispherical, before becoming more convex and flattening, sometimes irregularly. This may result in undulations in the cap, which may reach up to 12 cm (5 in) in diameter. The colour varies from white, through yellowish-white to shades of ochre, sometimes with a brownish centre. Occasionally parts of the fruiting bodies may have pinkish tones. The rest of the fungus below the cap is white. The crowded gills are free to narrowly adnate. The stipe is 8–20 cm (3–8 in) high and 1.5–2 cm (½–⅔ in) thick at the apex, and bears a thin white membranous ring. The volva is thin, smooth and sac-like, although may be quite extensive and contain almost half the stipe. The spore print is white, and the subglobose to ovoid to subellipsoid, amyloid spores are 9–14 x 7–10 μm viewed under a microscope. There is typically no smell, though some fruiting bodies may have a slight odour, described as that of bleach or chlorine, dead fish or iodine. Like other destroying angels, the flesh stains yellow when treated with potassium hydroxide (KOH).
This fungus resembles the edible mushrooms Agaricus arvensis and A. campestris, and the puffballs (Lycoperdon spp.) before the caps have opened and the gills have become visible, so those collecting immature fungi run the risk of confusing the varieties. It also resembles and grows in the same areas as the edible and prized Amanita velosa, which can be distinguished from A. ocreata by its lack of ring, striate cap margin and thick universal veil remnants comprising the veil. The edible Amanita lanei lacks a ring and is more likely to have veil patches remaining on its cap, which is generally darker. Volvariella speciosa has pink spores and no ring or volva.
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