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Boletellus chrysenteroides

[ Basidiomycota > Boletales > Boletaceae > Boletellus . . . ]

by Michael Kuo

Leccinum-like in its stem, Boletus chrysenteron-like in its cap surface, and Boletellus-like in its longitudinally ridged spores, this fairly rare bolete can be downright confusing. To confuse things even further, it likes to appear near (or even fruiting from) well decayed wood--a very un-bolete-ish habitat. Ultimately, however, the combination of all of these confusing features leads to a fairly easy identification.


Ecology: Associated with oaks and eastern hemlock; presumably mycorrhizal, but often found growing from or near well decayed oak stumps; usually growing alone; summer and fall; fairly widely distributed in eastern North America from roughly the Mississippi Valley eastward.

Cap: 2-10 cm; convex to broadly convex in age; dry; finely velvety to nearly bald; sometimes becoming cracked with age; dark brown to nearly black at first, becoming medium brown or eventually pale brown.

Pore Surface: Bright to dull yellow, becoming olive yellow; bruising slowly blue and eventually brown; 1-2 round to angular pores per mm; tubes to about 1 cm deep.

Stem: 2-13 cm long; up to 1.5 cm thick; more or less equal; at first punctuated by brownish, Leccinum-like scabers that later become aggregated into hairy or sub-scaly clusters that sometimes approximate the appearance of reticulation; yellowish to brownish at first, becoming reddish to purplish red in the mid-portion with age.

Flesh: Pale yellow to whitish, or with age reddish in the mid-portion of the stem and around damaged areas; changing to bluish or blue when sliced.

Odor and Taste: Not distinctive.

Chemical Reactions (per Grund & Harrison, 1976): Ammonia black on cap; brownish on flesh. KOH black on cap; brownish on flesh. Iron salts olive on flesh.

Spore Print: Olive brown.

Microscopic Features: Spores 10-17 x 5-8 µ; longitudinally twisted-grooved; ellipsoid; yellow in KOH. Pileipellis a trichoderm; terminal elements often cystidioid, with sub-terminal elements sometimes somewhat inflated.

REFERENCES: (Snell, 1936) Snell, 1941. (Coker & Beers, 1943; Singer, 1945; Snell & Dick, 1970; Smith & Thiers, 1971; Grund & Harrison, 1976; Smith, Smith & Weber, 1981; Weber & Smith, 1985; Both, 1993; Barron, 1999; McNeil, 2006.) Herb. Kuo 07171008.

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Boletellus chrysenteroides

Boletellus chrysenteroides

Boletellus chrysenteroides

Boletellus chrysenteroides

Boletellus chrysenteroides

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Kuo, M. (2012, February). Boletellus chrysenteroides. Retrieved from the MushroomExpert.Com Web site: