Boletellus chrysenteroides

[ Basidiomycetes > Boletales > Boletaceae > Boletellus . . . ]

by Michael Kuo

Description:

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.

Further Information Online:

Boletellus chrysenteroides in Smith & Thiers, 1971

Spores

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Cite this page as:

Kuo, M. (2012, February). Boletellus chrysenteroides. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletellus_chrysenteroides.html