Cortinarius rubellus, commonly known as the deadly webcap, is a species of fungus in the family Cortinariaceae, native to high-latitude temperate to subalpine forests of Eurasia and North America. 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. The mushroom is generally tan to brown all over, with a conical to convex cap 2.5 to 8 centimetres (1 to 3+1⁄4 in) in diameter, adnate gills and a 5.5 to 11 cm (2+1⁄4 to 4+1⁄4 in) tall stipe.

Closest relatives