Cap: 5-20 cm; convex, becoming broadly convex or almost flat; dry; dull; smooth; whitish.
Pore Surface: Whitish and appearing “stuffed” when young, becoming yellow or olive yellow; not bruising; 1-2 pores per mm at maturity; tubes to 2 cm deep.
Stem: 6-20 cm long; 2-6 cm thick; equal, or frequently club-shaped, especially when young; solid; whitish; not bruising, but sometimes developing brownish hues; finely reticulate.
Flesh: White; not staining on exposure.
Odor and Taste: Pleasant; not distinctive.
Chemical Reactions: Ammonia orange on cap surface; yellow on flesh. Iron salts gray on flesh.
Spore Print: Olive brown.
Spores 13-15 × 4-5 µ; smooth; subfusiform; yellowish in KOH. Hymenial cystidia mostly cylindric to subclavate; hyaline in KOH; to about 50 × 10 µ. Pileipellis a cutis of cylindric hyphae 4-6 µ wide.