Cap: 3-15 cm; convex, becoming broadly convex or flat; dry; velvety; sometimes with a white dusting when young; black or dark grayish brown; in my experience, often darkening on handling.
Pore Surface: Whitish becoming pinkish; bruising red, then brown to black; pores angular, 2 per mm; tubes to 1 cm deep.
Stem: 4-10 cm long; 2-4 cm thick; more or less equal, or enlarging towards base; colored like the cap or paler; sometimes with a white dusting; fairly smooth; not reticulate or merely finely so near the apex; in my experience, often darkening on handling.
Flesh: Thick and white; discoloring pinkish on exposure to air, then turning slowly grayish; black in the stem base.
Odor and Taste: Not distinctive.
Chemical Reactions: Flesh greenish to bluish with iron salts; pinkish orange with KOH; olive, then brownish orange with ammonia. Cap orangish with KOH; negative with iron salts or ammonia.
Spore Print: Pink.
Microscopic Features: Spores 7-11 × 3.5-5 µ; fusiform to subfusiform; smooth. Pileipellis a cutis of elements 4-7 µ wide, smoky yellowish in KOH.