Suillus weaverae
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Ecology: Mycorrhizal with eastern white pine; growing alone or, more often, gregariously; summer (often among the first species of Suillus to appear) through early winter or, in warm climates, over winter; originally described from Minnesota (but see discussion above); widely distributed throughout the natural range of eastern white pine, as well as areas where the tree is widely planted in urban locations and in woodland plantations. The illustrated and described collections are from Illinois.
Cap: 3-20 cm across; convex becoming broadly convex or nearly flat; sticky or slimy when fresh; bald; orange-brown to reddish brown when young, often with the pigment breaking up into mosaic-like patches; becoming dull orangish brown, yellow-brown, pale brown, or tan with maturity and eventually, in decay, dark brown; margin when young sometimes soft, whitish, and overhanging by a few millimeters.
Pore Surface: Often beginning to run down the stem; whitish at first, but soon yellowish and eventually dull brownish yellow; sometimes dotted with droplets of cloudy liquid when young; not bruising, or sometimes bruising and spotting brownish; pores about 1 mm wide at maturity; not strongly boletinoid but sometimes weakly so in age; tubes up to 1 cm deep.
Stem: 4-8 cm long; 1-2 cm thick; equal or with a tapering base; with tiny, yellow to pinkish or brownish glandular dots on the upper half or overall; without a ring; white, developing bright yellow shades near the apex or overall; sometimes bruising slowly brown where handled; basal mycelium white.
Flesh: White at first, but soon pale yellow; not changing when sliced.
Odor and Taste: Odor a little fragrant, or not distinctive; taste slightly sour, or not distinctive.
Chemical Reactions: Ammonia negative on dark young caps, and negative on older, less pigmented caps; pink on flesh; dull salmon pink on pore surface. KOH flashing dark green, then resolving to greenish black on young caps, but merely dark gray on older caps; dark gray to purplish or bluish on flesh; dull salmon pink on pore surface. Iron salts gray on young caps, but negative on older caps; bluish to purplish on flesh; olive to green on pore surface.
Spore Print: Cinnamon brown to brown.
Microscopic Features: Spores 6-10 x 2-3 m; boletoid-fusiform; smooth; hyaline to yellowish in KOH. Basidia 22-28 x 4-5 m; subclavate; 4-sterigmate. Hymenial cystidia in bundles; 30-90 x 4-11 m when clearly defined; cylindric with subclavate apices, or fusiform to lageniform; smooth; thin-walled; brown in KOH; often gelatinizing and poorly defined individually. Pileipellis an ixocutis; elements in young caps often obscured by extensive gelatinization and dark yellow-brown pigment globules; elements in older caps 2.5-10 wide, smooth or appearing encrusted by tiny pigment globules, brownish to brown in KOH.
