Boletus pulverulentus

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Ecology: Mycorrhizal with hardwoods or conifers; growing alone or scattered; summer and fall; northeastern North America and Texas.

Cap: 4-10 cm; convex, becoming broadly convex; dry or moist; finely velvety or dusted when young, but soon smooth; dark brown to blackish brown; bruising bluish black when fresh and young; sometimes becoming cracked in places, with reddish tints in and around the cracks.

Pore Surface: Yellow, becoming brownish yellow with age; bruising instantly dark blue; 1-2 angular pores per mm; tubes to 15 mm deep.

Stem: 4-8 cm long; 1-2.5 cm thick; more or less equal; solid; bright yellow at the apex; reddish brown to brown below; with raised ridges, though not truly reticulate; bruising blue; basal mycelium white but soon darkening to brown when handled.

Flesh: Yellow, staining instantly blue on exposure; red in the base of the stem.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia flashing green, then quickly resolving to black on the cap surface; erasing the blued areas of the flesh. KOH black on the cap surface; orangish on flesh. Iron salts negative on the cap surface; erasing the blued areas of the flesh.

Spore Print: Dark olive to olive brown.

Microscopic Features: Spores 11-14 x 4.5-6 ; smooth; subfusoid. Cystidia fusoid-ventricose; abundant; 32-50 x 8-15 ; with granular, amorphous, reddish brown content when mounted in Melzer's.

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