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Tylopilus felleus

[ Basidiomycetes > Boletales > Boletaceae > Tylopilus . . . ]

by Michael Kuo

Tylopilus felleus is an impressive mushroom, distinguished from most other boletes by its substantial and reticulate stem, its extremely bitter taste, and its flesh-colored pore surface. It is widely distributed and common east of the Rocky Mountains; look for it under conifers or in mixed woods.


Ecology: Mycorrhizal with conifers and, occasionally, with hardwoods; growing alone or scattered; summer and fall; widely distributed east of the Rocky Mountains.

Cap: 5-30 cm; convex to broadly convex or nearly flat in age; dry; smooth, unpolished; sometimes becoming cracked; brown to tan, usually with cinnamon shades, becoming paler in age.

Pore Surface: Whitish becoming pinkish to flesh-colored; sometimes bruising brownish; pores circular, 1-2 per mm; tubes to 2 cm.

Stem: 4-20 cm long; 1-3 cm thick; club-shaped and bulbous; pale above, colored like the cap downward--or brown overall; strongly reticulate, at least over upper third; sometimes with olive stains in age.

Flesh: Thick and white; unchanging or staining pinkish.

Odor and Taste: Taste very bitter; odor not distinctive.

Chemical Reactions: Cap surface orange to reddish orange with KOH or ammonia, olive with iron salts; flesh greenish yellow with KOH, pale yellow (with a bluish zone) with ammonia; grayish green with iron salts.

Spore Print: Flesh colored to pinkish.

Microscopic Features: Spores 11-17 x 3-5 µ; fusiform to subfusiform; smooth. Pileipellis a cutis of cylindric elements 4-7 µ wide; yellow in KOH; with rounded to subacute apices.

REFERENCES: (Bulliard, 1887) Karsten, 1881. (Fries, 1821; Saccardo, 1888; Coker & Beers, 1943; Singer, 1947; Snell & Dick, 1970; Smith & Thiers, 1971; Grund & Harrison, 1976; Smith, Smith & Weber, 1981; Phillips, 1991/2005; Lincoff, 1992; Both, 1993; Barron, 1999; Bessette, Roody & Bessette, 2000; Roody, 2003; McNeil, 2006; Miller & Miller, 2006; Binion et al., 2008.) Herb. Kuo 09050203.

Further Online Information:

Tylopilus felleus in Smith & Thiers, 1971
Tylopilus felleus at Roger's Mushrooms


Tylopilus felleus

Tylopilus felleus

Tylopilus felleus

Tylopilus felleus

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Kuo, M. (2001, September). Tylopilus felleus. Retrieved from the MushroomExpert.Com Web site: