Boletus separans
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Ecology: Mycorrhizal with oaks (and possibly with other hardwoods) and, more rarely, with conifers (including slash pine); growing alone, scattered, or gregariously; summer and fall; widely distributed east of the Rocky Mountains. The illustrated and described collections are from Illinois and Georgia.
Cap: 4-20 cm across; convex, becoming broadly convex in age; sticky when fresh, but soon dry; usually somewhat wrinkled; very finely velvety when young, but soon bald; lilac-brown to liver-red or cinnamon when young; lilac shades often disappearing in old age; at maturity yellowish brown to golden.
Pore Surface: White when young, becoming yellowish and finally bright brownish yellow (without olive shades); not bruising, or bruising deeper yellow or brownish when mature; pores "stuffed" when young; at maturity with 1-3 circular pores per mm at maturity; tubes 5-20 mm deep.
Stem: 4-12 cm long; 1-4 cm thick; usually club-shaped when young, becoming more or less equal with maturity; solid; bald; usually slightly wrinkled; weakly to prominently reticulate, over the apex or overall; pale above; usually flushed with the cap color in places below; sometimes developing yellow stains, especially near the apex; in old age often whitish to grayish, without any lilac shades; basal mycelium white.
Flesh: Whitish throughout, unchanging on exposure or bruising.
Odor and Taste: Pleasant; not distinctive.
Chemical Reactions: Ammonia green on cap surface when lilac shades are present (otherwise pinkish to negative); green on lilac-flushed areas of stem surface; negative to pinkish on flesh. KOH flashing green, then negative or dark brown on cap surface; sea green on lilac-flushed areas of the stem sea green; purple, resolving to pale pinkish on flesh. Iron salts gray on cap surface; negative to grayish on flesh.
Spore Print: Brownish to yellowish brown.
Microscopic Features: Spores 11-15 x 4-5.5 ; smooth; fusiform; yellowish in KOH. Hymenial cystidia absent. Pileipellis a tightly packed palisadoderm/epithelium; elements hyaline in KOH (or, when fresh, green); terminal cells clavate to obpyriform, 10-15 wide.
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