Suillus tomentosus

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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); originally described from Colorado; widely distributed in western North America, the northern Midwest, and montane Mexico; also reported from Central America. The illustrated and described collections are from Colorado.

Cap: 6-10 cm across; convex becoming broadly convex or nearly flat; sticky or fairly dry; at first covered with a fine, grayish, felty covering, but often becoming more bald with age; yellow to orangish yellow; with maturity usually becoming finely areolate with a mosaic-like pattern of tufts and cracks; sometimes developing reddish spots and stains; the margin at first inrolled.

Pore Surface: Brownish to orangish when young, becoming brownish yellow to brown, and eventually dark brown; bruising blue; with 2-3 angular pores per mm; tubes to 1 cm deep.

Stem: 6-9 cm long; 1.5-2.5 cm thick; equal or tapering to base; yellowish orange; covered with fine brownish glandular dots; often staining blue, then slowly brown on handling; without a ring.

Flesh: Whitish to yellowish in the cap; yellow in the stem; orange in the stem base; bluing on exposure, at least over the tubes and in the stem.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia negative on cap surface; negative on flesh. KOH pinkish, then purple on cap surface; purplish on flesh. Iron salts bluish gray on cap surface and flesh.

Microscopic Features: Spores 7-10 x 2.5-3.5 m; boletoid-fusiform; smooth; yellowish in KOH. Basidia 20-25 x 4-5 m; subcylindric; 4-sterigmate. Cystidia in bundles; often poorly defined individually; 30-70 x 6-12 m; clavate, subclavate, or fusiform; smooth; thin-walled; golden brown in KOH. Pileipellis a cutis or ixocutis; elements 4-10 m wide, smooth, hyaline to yellowish in KOH.

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