Cortinarius laniger, commonly known as the brown cortinarius or woolly webcap, is a species of mushroom in the family Cortinariaceae.
The brown cap of Cortinarius laniger starts out conical or rounded, becoming convex or almost flat as the mushroom gets older. It is about 3-10 centimeters in diameter. The gills can be notched, adnate, or adnexed, and are brown in color. The stipe is about 4-12 centimeters long and 0.7-2 centimeters wide. It is fibrillose. A cortina is present, and the spore print is rusty brown.
Cortinarius laniger is found in coniferous forests. Occasionally, it also grows under tanoak. It fruits during the autumn season.