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Summary: Features include 1) a viscid yellow cap with reddish to brown spots, streaks or plaques, 2) pale olive-yellow flesh that turns dull cinnamon or vinaceous when cut, 3) large, angular compound pores that stain dull cinnamon when bruised, 4) a yellowish stem that has brown to cinnamon glandular dots and smears and stains vinaceous or brown when handled, and 5) a veil that leaves remnants hanging from cap margin and sometimes forms a slight annulus. Suillus sibiricus is found in WA, OR, and ID, (Smith(34)). It is also found in BC (collections at the University of British Columbia), CA (Arora; collection at Oregon State University), AK, MT, and WY (collections at the University of Washington), and MI (Smith(35)). Distribution is eastern Canada south to NY, west to the Pacific Northwest, and also (reported from) the Southwest, (Bessette).
Cap: 3-10cm, obtuse to convex, becoming broadly convex to nearly flat when old, sometimes slightly umbonate; ground color dull to bright yellow or ocher-yellow to olive-yellow, scattered appressed scales dull reddish to cinnamon-brown or dark brown; viscid to glutinous; margin with hanging tufts of whitish cottony veil that may disappear when old, (Bessette), 3-10cm, convex to obtuse, expanding to flat or slightly umbonate; ground color "chamois" (Ridgway color) to dingy olive-yellowish, "spotted overall but especially toward the margin with snuff-brown to cinnamon-brown appressed squamules"; viscid to glutinous; "margin at first a with soft cottony roll of pale dingy yellow veil remnants", or the roll often breaking up into teeth and finally disappearing, (Smith(34)), "with scattered reddish to cinnamon-brown or dark brown spots, scales, streaks, or patches of fibrils, especially toward the margin (but these sometimes washed off by rain)", "cap is usually bright yellow in dry weather and duller or dingier when moist", (Arora)
Flesh: pale olive-yellow, slowly staining dull cinnamon when exposed, not turning blue, (Bessette), pale olive yellow, slowly becoming dull cinnamon when cut; in stem dingy olive-yellowish, (Smith(34)), thin, soft; yellow, not turning blue but often staining vinaceous or pinkish when bruised, (Arora)
Pores: 1-2mm, angular and compound; yellow to dingy ocher-yellow, "staining dull cinnamon when bruised"; tube layer 0.8-1.5cm thick, adnate to subdecurrent, (Bessette), 1-2mm, "angular and often compound", dingy ocher-yellow, "staining dull cinnamon when bruised"; tube layer 1-1.5cm thick, adnate becoming decurrent, dingy ochraceous to near "honey yellow" (Ridgway color), (Smith(34)), 1-2mm when mature, often somewhat radially arranged; mustard-yellow becoming duller or darker (ocher to yellow-brown) when old, not turning blue but may stain vinaceous or pinkish; tubes same color or dingier, (Arora)
Stem: 4-10cm x 0.6-1.5cm, nearly equal or narrowing downward, solid; yellow to dingy ocher-yellow, often stained vinaceous near base; "with reddish to dark brown glandular dots and smears", dry; partial veil cottony, whitish, typically leaving remnants on cap margin, sometime forming slight annulus on stem, (Bessette), 5-10cm x 0.7-1.5cm at top, solid; dingy ocher yellow in upper part, "soon stained vinaceous at base"; "glandular dotted overall"; occasional specimens with annulus but partial veil typically hanging on cap edge, (Smith(34)), often curved, solid or sometimes hollow when old; yellow to ocher-yellow, often staining vinaceous or brown when handled and often vinaceous-stained at base; glandular dots and smears often inconspicuous when young but typically brown to cinnamon and quite conspicuous when old; veil cottony, whitish to pale yellow or when old sometimes brownish, usually remaining attached to cap margin but sometimes forming slight annulus, (Arora)
Odor: not distinctive (Bessette), none or slight (Smith(34)), distinctive (Phillips)
Taste: acidic or not distinctive (Bessette), acidulous (Smith(34)), mildly bitter (Phillips)
Microscopic: spores 8-11 x 3.5-4.2 microns, narrowly elliptic, smooth, pale ochraceous, (Bessette), spores 8-11 x 3.8-4.2 microns, narrowly elliptic, smooth, pale tawny to yellowish in Melzer's reagent, pale dingy ochraceous in KOH; basidia 4-spored, 22-28 x 5-7 microns, clavate, nearly colorless in KOH; pleurocystidia 40-70 x 6-9 microns, "cylindric to narrowly clavate and often crooked, content of yellow to dark brown pigment", in bunches surrounded by brown amorphous pigment, cheilocystidia "similar to pleurocystidia, many somewhat ventricose", masses of amorphous pigment encrusted on wall end; cap epicutis "a pellicle of appressed-interwoven hyphae" 3-6 microns wide; caulocystidia similar to cheilocystidia; clamp connections absent, (Smith(34)), spores 8-12 x 3.5-4.5 microns, elliptic to spindle-shaped, smooth, (Arora)
Spore Deposit: dull cinnamon, (Bessette), "Sayal brown" (Ridgway color), (Smith(34)), brown to dull cinnamon-brown (Arora)
Habitat / Range
scattered or in groups under pine and larch, (Bessette), gregarious under Pinus monticola (Western White Pine), (Smith(34)), scattered to gregarious or clustered under conifers, associated with white (5-needle) pines, especially common in Pacific Northwest and northern California with Western White Pine, in Southwest with southwestern white pine and limber pine, (Arora), fall
Suillus flavidus generally has larger pores, has a somewhat smaller, more umbonate cap that is often pallid in color, and is associated with Lodgepole Pine rather than five-needle pine, (Thiers). S. flavidus is also described as bald (although Thiers describes reddish brown or concolorous plaques or spots as often on margin) and having a well developed gelatinous annulus. Suillus americanus in eastern North America (reported from the Southwest with a few records from Pacific Northwest), has a brighter yellow cap with reddish to cinnamon patches and a thinner stem that is typically less than 1cm, and does not have an annulus, (Bessette). S. americanus does not stain vinaceous in the stem base, (Thiers). S. americanus has a thinner stem that is never hollowed out, and veil material seldom if ever occurs on the stem, (Smith(34)).
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2020-08-07 11:42:29 AM
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