Boletus pallidoroseus

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by Michael Kuo

Like a cross between Boletus bicolor and Boletus pseudosensibilis, this fairly recently described species features pink colors, blue bruising, and a green reaction to ammonia. Bolete expert Ernst Both (1998) originally described Boletus pallidoroseus from New York, but it has since been collected in North Carolina and West Virginia, according to Bessette and collaborators (2000)--and the illustrated collection, an apparent match, was made in Illinois.

Description:

Ecology: Mycorrhizal with hardwoods--perhaps exclusively with oaks; growing alone, scattered, or gregariously; summer and fall; known from New York, West Virginia, North Carolina, and Illinois.

Cap: 6-17 cm; convex, becoming broadly convex or almost flat; dry; smooth or finely velvety in places; rose pink when young, fading to pinkish tan.

Pore Surface: Yellow, becoming olive yellow; bruising blue; pores circular, 1-2 per mm; tubes shallow, under 1 cm deep.

Stem: 5-8 cm long; 2-3 cm thick; more or less equal; not reticulate, or faintly so at the apex; fairly smooth; yellowish above; rose pink below (remaining so when the cap fades); bruising blue, then slowly brownish; basal mycelium whitish.

Flesh: White to yellowish in the cap; yellow in the stem; bluing in places when sliced.

Odor and Taste: Odor like beef bouillon; taste mild.

Chemical Reactions: Ammonia flashing green to blue-green on cap surface; yellow to orangish on flesh. KOH rusty brown to orangish on cap surface; yellow to orangish on flesh. Iron salts negative on cap surface; negative on flesh.

Spore Print: Olive brown.

Microscopic Features: Spores 9-12 x 3.5-5.5 µ; smooth; subfusiform; yellow in KOH. Hymenial cystidia fusoid-ventricose to fusoid or subclavate; yellow in KOH; to about 40 x 15 µ. Pileipellis a tangled layer of cylindric hyphae 3-8 µ wide, with rounded to subacute apices.

REFERENCES: Both, 1998. (Both, 1998; Bessette, Roody & Bessette, 2000.) Herb. Kuo 08020401, 09070702.

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Cite this page as:

Kuo, M. (2007, December). Boletus pallidoroseus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletus_pallidoroseus.html