Imperator torosus

Imperator torosus.
Imperator torosus, the brawny bolete, is a fungus in the family Boletaceae. Native to southern Europe, the Caucasus and Israel, it is generally associated with deciduous trees such as hornbeam, oak and beech in warm, dry locales. Although generally rare in Europe, it appears to be relatively common in Hungary. Appearing in summer and autumn on chalky soils, the stocky mushrooms have an ochre cap up to 20 cm (8 in) across, yellow pores on the cap underside, and a wine-red to brown or blackish stalk up to 6–15 cm (2.4–5.9 in) long by 3–6 cm (1.2–2.4 in) wide. The pale yellow flesh changes colour when broken or bruised depending on age; younger mushrooms become reddish, and older ones take on bluish tones. Swedish mycologists Elias Magnus Fries and Christopher Theodor Hök described this species as Boletus torosus in 1835, relying in part on the work of Louis Secretan. Eating raw, or sometimes even cooked, mushrooms of this species leads to vomiting and diarrhea.