Major Groups > Boletes > Suillus > Suillus bresadolae


Suillus bresadolae

[ Basidiomycota > Boletales > Suillaceae > Suillus . . . ]

by Michael Kuo

Suillus bresadolae is a denizen of the European mountains, associated with European larch in the Alps and the Carpathians. It features a thickly slimy, reddish brown cap, a gray pore surface composed of large, radially arranged pores, and a reddish brown stem with a collapsed ring and a yellow apex.

There are several similar mushrooms, also associated with larch. Suillus viscidus features a gray to pale grayish brown cap, and a whitish pore surface; Suillus tridentinus features a drier, more fibrillose cap and a bright orange pore surface; Suillus grevillei has a dry cap ranging from yellow to brownish red, and a bright yellow pore surface. Finally, Suillus bresadolae flavogriseus, sometimes called Suillus nueschii, features a yellow cap and stem with a whitish veil.


Ecology: Mycorrhizal with European larch; growing alone or gregariously; fall; originally described from Italy; probably widespread in the Alps and the Carpathians, throughout the natural range of the host tree. The illustrated and described collection is from Italy.

Note: A solitary specimen is described.

Cap: 7 cm across; broadly convex; sticky; smooth or slightly wrinkled under the gluten; reddish brown to orangish brown; whitish at the margin; staining waxed paper bluish.

Pore Surface: Dull gray; pores large and angular, about 1–2 mm in length, in boletinoid (radial) arrangement; tubes to about 10 mm deep, turning grayish-bluish where sliced.

Stem: 5 cm long; 1 cm thick; more or less equal above an abruptly tapered base; reddish brown below; with a collapsing, gelatinized, yellowish ring; fairly bright yellow at the apex, above the ring; basal mycelium whitish.

Flesh: Pale yellow in cap and upper stem; darker yellow in stem base; when sliced turning greenish to bluish or grayish-bluish in places.

Odor and Taste: Not distinctive.

Microscopic Features: Spores 8–13 x 4–5 µm; boletoid-fusiform; smooth; dull yellow in KOH. Basidia 28–35 x 7–10 µm; clavate; 4-sterigmate. Cystidia in bundles; 50–70+ x 7.5–10; mostly cylindric with subclavate or merely rounded apices; thin-walled; smooth; brown in KOH. Pileipellis an ixocutis. Clamp connections not found.

REFERENCES: (L. Quélet, 1881) N. Gerhold, 1985. (Breitenbach & Kränzlin, 1991; Kretzer et al., 1996; Nonis, 2007; Klofac, 2013; Kibby, 2020.) Herb. Kuo 10141407.

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Suillus bresadolae

Suillus bresadolae

Suillus bresadolae

Suillus bresadolae

Suillus bresadolae

Suillus bresadolae

Suillus bresadolae

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Kuo, M. (2022, January). Suillus bresadolae. Retrieved from the MushroomExpert.Com Web site: