Cortinarius rubellus, commonly known as the Deadly Webcap, is a lethally poisonous mushroom that smells of radishes and is reddish-orange with a pointed, umbonate cap covered with fibrils.

Cap conical to convex (partly flattening to umbonate with maturity). In colour, it is a tawny to date brown with paler margins and is covered in fine, fibrous scales. The gills are ochre- or caramel-coloured, changing to a deeper brown with age as the spores mature. They have an adnate connection to the stipe. The Stem has a bulbous base. It is the same colour or slightly paler than the cap and can have yellow fragments of the veil (cortina) attached to its lower half. The flesh is cream or pale yellow, but more tan below the pileipellis and in the stem base. It smells slightly of radishes and has no strong taste.

Similar species include Cortinarius limonius, which is also poisonous but has more vivid orange colouring. Cortinarius orellanus has a less conical cap and grows near deciduous trees.

Cortinarius rubellus on the www.first-nature.com web site.