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Species Information
Summary: Features include 1) smooth, slimy dark brown to vinaceous brown or reddish brown cap, 2) white to yellow flesh that does not turn blue, 3) whitish to yellowish pores and tubes that do not turn blue, 4) absent veil, 5) stem that lacks glandular dots and is usually short, and 6) growth under Lodgepole Pine. This is "among our most common and widespread species" of Suillus in the Pacific Northwest (Trudell(4)).
It is found in ID, OR, WA, and also CA, CO, FL, MI, TN, TX, WV, WY, (Smith), PQ, AL, (Lincoff), NS (Grund), BC (in Redhead), and MT (L. Evans, pers. comm.).
Cap: 5-10cm, hemispheric to broadly convex, becoming nearly flat; variable in color, dark vinaceous brown when young, becoming paler to dull cinnamon, at times dingy yellow ocher when old; bald, glutinous; margin in buttons faintly white-tomentose but veil lacking and no roll of cottony tissue present, (Smith), 5-10cm, obtuse becoming broadly convex to nearly flat when old; "dark brown, vinaceous brown to cinnamon-brown, or grayish brown", fading to cinnamon or tan when old; bald, viscid; margin typically entire, incurved at first, (Bessette), 5-13cm, convex becoming broadly convex to flat; dark vinaceous brown to dark brown, often fading when old to reddish brown, dull cinnamon, or even tan, sometimes appearing streaked; "smooth, viscid or very slimy when moist, often shiny when dry"; margin naked, (Arora), dark red-brown or gray-brown becoming more red or yellowish brown; margin sometimes slightly lobed (Phillips), dark vinaceous brown to cinnamon brown when fresh, becomes streaked and yellowish when old, (Trudell)
Flesh: soft; white when young, becoming yellow when old at least in top of stem, unchanging where bruised, (Smith), white, often becoming yellow, at least in stem top when old, unchanging when cut, (Bessette), thick, soft; white or becoming yellow when old, not turning blue when bruised, (Arora)
Pores: 1-2 per mm when mature, round, not elongating radially appreciably; pale dingy yellow when young, spotted from spores and cheilocystidia when old; tube layer 0.4-1cm thick, adnate to decurrent, dingy yellow, darker and more olivaceous when old, (Smith), 1-2 per mm, round; whitish to pale yellow, becoming yellow to dingy yellow when old, unchanging; tube layer 0.3-1cm thick, honey-yellow to olivaceous yellow, (Bessette), pores and tubes pale when young, becoming darker or dingier yellow when old and finally olive-yellow, not turning blue, (Arora)
Stem: 2-5cm x 1-2(3)cm, solid; white becoming pale yellow; unpolished to pruinose under hand lens, when young lacking glandular dots, when old glandular dots visible at times but never well developed, (Smith), 2-5cm x 1-2cm, nearly equal or narrowing in either direction, solid; white to pale yellow; dry, nearly bald, occasionally with inconspicuous glandular dots visible when old; partial veil and annulus absent, (Bessette), 2-7cm x 1-2(3)cm, equal or widening slightly downward, firm, solid; white becoming pale yellow when old; glandular dots absent or sometimes barely visible when old; veil absent, (Arora)
Chemical Reactions: cap cuticle brownish black with application of KOH, flesh olive with application of FeSO4, (Bessette)
Odor: not distinctive (Smith, Bessette)
Taste: not distinctive (Smith, Bessette)
Microscopic: spores 7-9(10) x 2.8-3.2 microns, elliptic to oblong, smooth, inamyloid, pale yellowish; basidia 4-spored, 18-24 x 5-6 microns, clavate, colorless in KOH, yellowish in Melzer''s reagent; pleurocystidia (in bunches with amorphous brown pigment surrounding base of cluster), 35-50 x 6-9 microns, cylindric to clavate, colorless to brown, cheilocystidia similar or larger and more broadly clavate; clamp connections absent, (Smith), spores 7-10 x 2.5-3.5 microns, narrowly elliptic, (Bessette), spores 7-10 x 3-4 microns, elliptic to spindle-shaped, (Arora)
Spore Deposit: near "cinnamon" (Smith), cinnamon-brown (Bessette), brown to dull cinnamon (Arora)
Habitat / Range
scattered to cespitose [in tufts] under 2-needle and 3-needle pines, in the Rocky Mountains and the Pacific Coast under P. contorta, summer, fall, warm wet winter weather, (Smith), scattered or in groups under pine, August to November, (Bessette), scattered to densely gregarious under conifers, particularly 2-needle and 3-needle pines, also spruce, (Arora), June to November (Phillips), summer, fall
Similar Species
Suillus granulatus has a stem distinctly more glandular dotted when young, and the cap is typically more mottled, (Smith). Suillus pseudobrevipes has a honey-yellow to yellow-brown cap with an appendiculate margin and annulus, (Bessette). S. neoalbidipes has a distinct band of cottony tissue on the margin of young caps, small clusters of caulocystidia, and rare to few clusters of pleurocystidia, whereas S. brevipes has bald cap margin, small clusters of caulocystidia, and numerous clusters of pleurocystidia, (Palm). Suillus borealis and Suillus neoalbidipes have a cottony roll on the margin of young caps and often have recognizable veil remnants, (McKnight). See also SIMILAR section of Suillus albivelatus, Suillus pallidiceps, and Suillus quiescens.
