Amanita merxmuelleri is a mushroom from the Amanita genus. Common names include rau-rau and piojento.
Amanita merxmuelleri has a 65âÂÂ150 mm wide, gray-brown cap. When young, its cap is hemispheric to convex, whilst young, and later the cap shape is depressed. The flesh inside the mushroom is whitish. The volva is presented as irregularly placed warts on the disc.
Amanita merxmuelleri is found in the southern part of South America in Argentina and Chile.
Amanita merxmuelleri is an ectomycorrhizal mushroom that forms a relationship with plants from the Nothofagus genus, such as N. pumilio, N. dombeyi, and N. obliqua.
The mushroom is free of any dangerous chemicals found other Amanita mushrooms. However, eating mushrooms from the Amanita genus is not recommended.