Suillus subalutaceus
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Ecology: Mycorrhizal with red pine; growing alone, scattered, or gregariously; late summer and fall; originally described from Michigan (Smith & Thiers 1964); distributed in the northern Midwest and northeastern North America, south into the Appalachian Mountains. The illustrated and described collections are from Kentucky and Ohio.
Cap: 3.5-7 cm; convex at first, becoming broadly convex; sticky to slimy when fresh; innately and sparsely fibrillose; yellow when young, maturing to dull orangish brown or cinnamon brown; often featuring white partial veil remnants on the margin.
Pore Surface: Yellow, becoming brownish yellow; not bruising; pores round to angular, about 2-3 per mm; tubes to 8 mm deep.
Stem: 5-8 cm long; 0.5-1.5 cm thick; tough; equal; yellow and bald at the apex; whitish to yellowish below, with brown glandular dots; with a thin whitish ring that is often a little gelatinized at first, and later collapses against the stem, becoming grayish to brownish; basal mycelium white.
Flesh: Whitish to pale yellow or slightly orangish (but not dark pinkish orange); not staining on exposure.
Odor and Taste: Odor not distinctive; taste of flesh not distinctive; taste of cap slime mild, not acrid.
Chemical Reactions: Ammonia negative on cap surface; negative on flesh. KOH dark gray on cap surface; gray on flesh. Iron salts negative on cap surface; negative on flesh.
Spore Print: Cinnamon brown.
Microscopic Features: Spores 7-11 x 3-4 m; boletoid-fusiform; smooth; yellowish in KOH. Basidia 22-25 x 3-4 m; clavate; 4-sterigmate. Cystidia in gelatinized bundles, often poorly defined individually; 45-70 x 5-8; cylindric to clavate; thin-walled; smooth; brownish purple in KOH. Pileipellis an ixocutis of elements 2-4 m wide, smooth, hyaline to yellowish in KOH.
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