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Phylloporus rhodoxanthus: The "Gilled Bolete"

[ Basidiomycetes > Boletales > Boletaceae > Phylloporus . . . ]

by Michael Kuo

The "gilled bolete" looks like--well, a bolete with gills. Two to six different gilled boletes occur in North America, depending on which mycologist you're talking to; see the Key to Phylloporus for the gory details. Broadly speaking, however, Phylloporus rhodoxanthus is the common gilled bolete on our continent, and it can be recognized by its pale to golden yellow gills (which may or may not bruise blue), and its bolete-like stature. The cap color ranges from brownish to reddish.

The most common and widely distributed species, Phylloporus rhodoxanthus ssp. americanus, is described below.


Ecology: Mycorrhizal with hardwoods, especially oaks and Beech; growing alone, scattered, or gregariously; summer and fall; widely distributed in North America.

Cap: 2.5-10 cm; convex, becoming broadly convex to more or less flat; dry; fairly smooth, sometimes beginning to crack in age; red to reddish brown, or olive brown to brown; fading; the margin inrolled when young, and with a small projecting sterile portion.

Gills: Running down the stem; distant or nearly so; yellow to golden yellow, dirtying with age; not bruising blue; thick; sometimes forking; sometimes with cross-veins.

Stem: 3-9 cm long; .5-1.5 cm thick; more or less equal, or tapering to base; sometimes appearing "ribbed" near the apex at the termination points of the gills; yellowish, with reddish dots and scruffies; basal mycelium yellow.

Flesh: White to pale yellow.

Odor and Taste: Odor not distinctive; taste mild.

Chemical Reactions: Cap surface blue with ammonia.

Spore Print: Yellowish to dirty yellow.

Microscopic Features: Spores 8-14 x 3-5 µ; smooth; long-elliptical to sausage-shaped.

REFERENCES: (Schweinitz, 1822) Bresadola, 1900. (Singer, 1945; Snell & Dick, 1970; Smith, Smith & Weber, 1979; Weber & Smith, 1985; Arora, 1986; Phillips, 1991/2005; Lincoff, 1992; Both, 1993; Horn, Kay & Abel, 1993; Barron, 1999; Bessette, Roody & Bessette, 2000; Roody, 2003; McNeil, 2006; Miller & Miller, 2006; Kuo, 2007; Ortiz-Santana et al., 2007.) Herb. Kuo 07089503, Moore 08300215, 07160403, 07070703, 07080705.

For help sorting out the various species, subspecies, varieties, and forms of the gilled bolete, see the Key to Phylloporus.

Further Online Information:

Phylloporus rhodoxanthus at Roger's Mushrooms


Phylloporus rhodoxanthus

Phylloporus rhodoxanthus

Phylloporus rhodoxanthus

Phylloporus rhodoxanthus

Phylloporus rhodoxanthus

Phylloporus rhodoxanthus

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Kuo, M. (2005, March). Phylloporus rhodoxanthus: The "gilled bolete." Retrieved from the MushroomExpert.Com Web site: