Cortinarius orellanus Cortinarius orellanus, commonly known as the fool's webcap or fools webcap, is a species of deadly fungus in the family Cortinariaceae native to Europe. Within the genus it belongs to a group known as the Orellani, all of which are highly toxic—eating them results in kidney failure, which is often irreversible. 1 flatklokkehatt 2 The Orellani are a group of seven related species in the genus Cortinarius that have been classified as a section of the subgenus Leprocybe or a subgenus in their own right. [1] They are among world's most poisonous mushrooms as they contain the highly toxic compound orellanine. 3 spiss giftslørsopp 4 Unlike Cortinarius rubellus, the stem of Cortinarius orellanus does not have a pronounced yellowish snakeskin-like surface pattern. The stem is typically 7 to 15mm in diameter and 5 to 10 cm tall. Spores. Ellipsoidal to sub-globose, x μm; with a rough surface. Spore print. Rusty reddish-brown. Odour/taste: Slight smell of radish. 5 Cortinarius caperatus, the "gypsy mushroom", is an edible mushroom found in northern regions of Europe and North America. Cortinarius orellanus and C. rubellus are two of the deadly webcaps found in Europe and North America. References Wikimedia Commons has media related to Cortinarius. 6 Orellanine is a highly nephrotoxic bipyridine N -dioxide found in various mushrooms of the Cortinariaceae family, including fool’s webcap (Cortinarius orellanus) and deadly webcap (Cortinarius rubellus formerly named Cortinarius speciosissimus or Cortinarius orellanoides). 1, 2 These two species are regarded as two of the world’s most toxic m. 7 hvit fluesopp 8 Butt giftslørsopp er en dødelig giftig sopp som ligner på spiss giftslørsopp, men mangler spissen på hatten. 9 Butt giftslørsopp (Cortinarius orellanus) er en av Norges aller giftigste sopper. 10 It is caused by the ingestion of orellanine, the main toxin of different types of Cortinarius mushrooms (Cortinarius speciosissimus, C. orellanus, C. orellanoides, etc.), and it is characterized by progressive clinical phases with a predominant kidney involvement, finally requiring renal replacement therapy in about 10% of cases. 11