Red Volva Amanita

The cap of A. rubrovolvata is 2.0–6.5 centimetres (13⁄16–2+9⁄16 inches) wide, convex to flattened, sometimes with a slight umbo. They are dark red to reddish-orange, becoming a paler orange to yellowish at the margin. The cap surface is densely covered with red to orange to yellow, powdery to granular remnants of the volva. The cap margin is grooved—with the grooves extending to between 30% and 60% of the radius—and does not have partial veil remnants hanging along the cap margin. The flesh of the mushroom is white to yellow, or reddish immediately beneath the cap cuticle. The white gills are free from attachment to the stem and are 3 to 6 mm (1⁄8 to 1⁄4 in) broad. The lamellulae (short gills that do not extend fully from the cap edge to the stem) are truncate, and typically range in length between 15 and 50% of the length of the gills. The stem is 50–100 mm (2–4 in) by 5–10 mm (1⁄4–3⁄8 in) thick, roughly cylindrical or slightly larger upwards, with a surface that is cream above the ring and cream to yellowish below. The bulb at the base of the stem is roughly spherical, and 1–2 cm (1⁄2–3⁄4 in) wide, with its upper part covered with red, orange to yellow woolly to powdery remnants of the volva. The volva remains in mature specimens as a ring around the upper part of the stem bulb. …

A. rubrovoltata mushrooms grow in groups on the ground. Amanita species form mycorrhizal relationships with trees. This is a mutually beneficial relationship where the hyphae of the fungus grow around the roots of trees, enabling the fungus to receive moisture, protection and nutritive byproducts of the tree, and affording the tree greater access to soil nutrients. The original Japanese collections were made in forests dominated by Japanese beech (Fagus crenata), but it has also been found growing near Quercus luecotrichophora, Rhododendron arboreum, and Myrica esculenta in India, in Castanopsis-Schima forest in Nepal, and in Castanopsis indica plantations in the Himalayas. The species occurs in China, northern India, Nepal, Gharwal Himalaya, South Korea, and countries of Southeast Asia (for example, Thailand). The southern limit of the distribution extends to southern Malay Peninsula.