| Major Groups > Boletes > Boletus > Boletus innixus |
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Boletus innixus [ Basidiomycetes > Boletales > Boletaceae > Boletus . . . ] by Michael Kuo Boletus innixus is a very attractive eastern bolete, recognized by its relatively dry, brown to reddish brown cap, its bright yellow pore surface, its bulbous stem with a small "root" below it, its tendency to grow in little clusters, and the absence of any bruising or staining reactions. The principal source of identification confusion for Boletus innixus is Boletus auriporus; see the comments below for help separating the two. Boletus innixus is edible; I have not tried it. Description: Ecology: Mycorrhizal with hardwoods, especially oaks; growing alone, gregariously, or (most typically) in small fused clusters; summer and fall; widely distributed east of the Rocky Mountains. Cap: 3-8 cm; convex, becoming broadly convex; dry or somewhat tacky when wet; smooth, but sometimes cracking in age; margin even; brown or reddish brown, fading to cinnamon tan. Pore Surface: Bright yellow; not bruising; 1-3 pores per mm when young, but pores up to 2 mm across in age; tubes to 1 cm deep. Stem: 3-6 cm long; 1-1.5 cm thick at apex; usually bulbous, with a small rootlike projection below the bulb; dry, or sometimes slimy near the base; more or less smooth; not reticulate; yellowish, with brownish streaks; basal mycelium yellow. Flesh: White to yellow; often staining somewhat pinkish in the cap on exposure, or brownish in the stem. Odor and Taste: Not distinctive. Chemical Reactions: Cap with a green flash, then dull orangish or reddish with ammonia; dark red to reddish brown with KOH; reaction to iron salts not recorded. Flesh pinkish to orangish with ammonia or KOH; pale gray with iron salts. Spore Print: Olive brown. Microscopic Features: Spores 8-11 x 3-5 µ; smooth; subfusiform. Boletus caespitosus and Pulveroboletus caespitosus are synonyms. REFERENCES: Frost, 1874. (Frost, 1874; Saccardo, 1891; Snell & Dick, 1970; Smith & Thiers, 1971; Grund & Harrison, 1976; Weber & Smith, 1985; Arora, 1986; Phillips, 1991; Both, 1993; Both, 1998; Bessette, Roody & Bessette, 2000; Roody, 2003.) Herb. Kuo 08050308, 09180301, 06290704. Boletus auriporus is similar, but has a quite slimy cap and stem when young and fresh. Its cap surface does not flash green with ammonia. In addition, its stem is not typically bulbous, it does not typically grow in clusters, its spores measure 11-16 x 4-6 µ, and it has white basal mycelium and tiny yellow granules or hairs on the stem. It is found under hardwoods east of the Rocky Mountains, and its range extends as far south as Costa Rica. Further Online Information: Boletus innixus at Macrofungi of Costa Rica |
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Cite this page as: Kuo, M. (2003, August). Boletus innixus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletus_innixus.html |