The brown cap of Cortinarius laniger starts out conical or rounded, becoming convex or almost flat as the mushroom getsolder. 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.