Cap: Up to 40 mm diam.; hemispherical or broadly umbonate‑expanded, sometimes campanulate. Colour brown to yellow‑brown, often with a distinct olive tinge over the disc; margin paler or yellow. Surface dry, but subviscid when moist; glabrous, innately fibrillose or subsquamulose; hygrophanous. Margin striate when fresh, occasionally with yellow‑brown fibrillose veil remnants.
Lamellae: 14-20, with 3-5 tiers; emarginate, sometimes slightly decurrent with a short tooth; up to 5 mm wide. Colour mustard yellow, becoming yellow‑brown with a rust‑brown tinge. Edges concolorous, even or dentate.
Stipe: Up to 50 x 7 mm, cylindrical (rarely subclavate or subfusoid), central; single or cespitose. Colour yellow, below a yellow‑brown fibrillose cortina with several appressed veil zones (inconspicuous to persistent). Surface dry, longitudinally fibrillose, hollow. Base sometimes with yellow basal tomentum, which turns pink or pale cinnabar‑red in dried material.
Context: Yellow‑brown, becoming dark brown in the stipe base.
Odour/taste: Odour distinctly raphanoid. Taste bitter to raphanoid.