Cap: 4-20 cm; convex with a shallow central depression, becoming shallowly to deeply vase-shaped; dry; smooth; finely velvety to the touch, at least when young; whitish when very young or when covered with leaves, but soon becoming brownish pink to pinkish brown, and eventually darkening to brick red.
Gills: Attached to the stem or beginning to run down it; close or nearly distant; whitish, maturing to buff; staining greenish, then brown where damaged.
Stem: 2-7 cm long; 1-3 cm thick; more or less equal; hard; bald; without potholes; white, or becoming colored like the cap; hollowing; dry.
Flesh: White; staining purplish pink, then greenish when sliced.
Milk: White, turning slowly greenish, then brownish; copious; sticky; staining tissues greenish, then brownish; staining white paper yellow.
Odor and Taste: Odor fragrant, or not distinctive; taste strongly acrid.
Spore Print: White to pale yellowish.
Spores 7.5-10.5 × 5.5-8 µ; subglobose to broadly ellipsoid; ornamentation well under 0.5 µ high, as isolated warts and rare, scattered connectors. Pleuromacrocystidia abundant; subcylindric to subfusoid; to about 130 × 15 µ. Cheilocystidia similar but shorter. Pileipellis a cutis-like tangle of cylindric elements that are often aggregated into upright fascicles of pileocystidia up to 100 µ long and 5 µ wide.