Rubroboletus satanas, commonly known as Satan's bolete or the Devil's bolete, is a basidiomycete fungus of the bolete family (Boletaceae) and one of its most infamous members. It was known as Boletus satanas before its transfer to the new genus Rubroboletus in 2014, based on molecular phylogenetic data. Found in broad-leaved and mixed woodland in the warmer regions of Europe, it is classified as a poisonous mushroom, known to cause gastrointestinal symptoms of diarrhea and violent vomiting. However, reports of poisoning are rare, due to its striking appearance and at times putrid smell, which discourage casual experimentation. The squat, brightly coloured fruiting bodies are often massive and imposing, with a pale, dull-coloured velvety cap up to , extraordinarily , very rarely across, yellow to orange-red pores and a bulbous red-patterned stem. The flesh turns blue when cut or bruised, and overripe fruit bodies often emit an unpleasant smell reminiscent of carrion. It is arguably the largest bolete found in Europe. Taxonomy and phylogeny Originally known as Boletus satanas, the Satan's bolete was described by German mycologist Harald Othmar Lenz in 1831. Lenz was aware of several reports of adverse reactions from people who had consumed this fungus and apparently felt himself ill from its "emanations" while describing it, hence giving it its sinister epithet. The Greek word (satanas, meaning Satan), is derived from the Hebrew śāṭān (שטן). American mycologist Harry D. Thiers concluded that material from North America matches the species description, however, genetic testing has since confirmed that western North American collections represent Rubroboletus eastwoodiae, a different species. Genetic analysis published in 2013 revealed that B. satanas and several other red-pored boletes, are part of the "/dupainii" clade (named after B. dupainii), and are distantly nested from the core group of Boletus (including B. edulis and relatives) within the Boletineae. This indicated that B. satanas and its relatives belonged to a distinct genus. The species was hence transferred to the new genus Rubroboletus in 2014, along with several allied red-pored, blue-staining bolete species. Genetic testing on several species of the genus revealed that R. satanas is most closely related to R. pulchrotinctus, a morphologically similar but much rarer species occurring in the Mediterranean regions Common names Both Rubroboletus satanas and Suillellus luridus are known as ayimantari ('bear mushroom') in eastern Turkey. Description The compact cap can reach an impressive , extraordinarily , very rarely in diameter. At first it