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Suillus tomentosus

[ Basidiomycetes > Boletales > Suillaceae > Suillus . . . ]

by Michael Kuo

Suillus tomentosus is one of only a few blue-staining species of Suillus. This fact, together with the orangish, "tomentose" (Mycologese for "velvety" or "felty") cap and the association with lodgepole pine or jack pine, makes the mushroom fairly easy to identify.

The European species Suillus variegatus also grows under 2-needle pines; it is virtually identical, but lacks glandular dots on the stem. Some authors consider Suillus tomentosus and Suillus variegatus to be synonyms.


Ecology: Mycorrhizal with two-needle pines, especially lodgepole pine and jack pine; growing scattered or gregariously; summer and fall (also in winter in coastal California); widely distributed in North America but apparently rare or absent in the southeast.

Cap: 5-15 cm; convex becoming broadly convex; sticky or fairly dry; at first covered with a fine, grayish, felty covering, but often becoming smoother with age; yellow to orangish yellow; sometimes developing reddish spots and stains; the margin at first inrolled.

Pore Surface: Brownish to cinnamon when young, becoming brownish yellow to olive yellow; bruising blue; 1-2 angular pores per mm; tubes to 2 cm deep.

Stem: 4-12 cm long; 1-3 cm thick; equal or somewhat club-shaped; yellowish orange; covered with brownish glandular dots; staining brownish on handling; without a ring.

Flesh: Whitish to yellowish in the cap; yellow in the stem; bluing on exposure.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia reddish to grayish or negative on the cap surface; brownish on flesh. KOH pinkish, then purple on cap surface; dark brown on flesh. Iron salts greenish to grayish on cap surface; gray to brown on flesh.

Spore Print: Olive brown when fresh, drying cinnamon brown.

Microscopic Features: Spores 7-12 x 3-5 µ; smooth; subfusoid.

REFERENCES: (Kauffman, 1921) Singer, 1960. (Smith & Thiers, 1964; Snell & Dick, 1970; Smith & Thiers, 1971; Thiers, 1975; Grund & Harrison, 1976; Smith, Smith & Weber, 1981; Arora, 1986; States, 1990; Lincoff, 1992; Both, 1993; Evenson, 1997; Bessette, Roody & Bessette, 2000; McNeil, 2006; Miller & Miller, 2006; Ortiz-Santana et al., 2007.) Herb. Kuo 08130703.

This site contains no information about the edibility or toxicity of mushrooms.


Suillus tomentosus

Suillus tomentosus

Suillus tomentosus

Suillus tomentosus

Suillus tomentosus

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Kuo, M. (2007, December). Suillus tomentosus. Retrieved from the MushroomExpert.Com Web site: