Pileus 6-16 cm broad, convex when young, becoming broadly convex to highly irregular in outline; surface very viscid, glabrous but often appearing streaked by the gluten, sometimes appearing appressed fibrillose on the margin, smooth; color when young brown ("walnut brown" to "burnt umber" to "Vandyke brown") to sometimes dark brown ("warm sepia" to "bister"), unchanging or fading to light brown ("cinnamon" to "orange-cinnamon" to "Mikado brown") with age; margin strongly incurved when young, becoming decurved to plane to irregular with age, entire. Context 1-2 cm thick, white, unchanging when exposed. Taste mild; odor pungent.
Tubes 1 cm long, decurrent, occasionally slightly depressed, whitish to tan ("ochraceous-buff") when young, changing to yellow ("antimony yellow" to "yellow ocher"), unchanging or becoming brownish when bruised, strongly boletinoid during all stages of development; pores 1-3 mm long, compound, concolorous.
Stipe 3-5 cm long, 1-2 cm thick at the apex, equal to somewhat pinched at the base, solid; surface strongly glandulose, yellow at the apex, whitish below, darkening when handled, dry; no annulus. Context white, occasionally changing to yellow, typically vinaceous at the base.
Spore print brown. Spores 7.5-9 X 3-4 Ám, subellipsoid to oblong, ventricose in side view, smooth, thin-walled, hyaline in KOH and Melzer's.
Basidia 27-32 X 6-9 Ám, clavate, four-spored. Hymenial cystidia 45-60 X 7-10 Ám, scattered to numerous, clustered, cylindric to clavate, hyaline, incrusted, dark brown in KOH.
Tube trama divergent, gelatinous, hyphae 4-6 Ám wide. Pileus trama interwoven, homogeneous. Pileus cuticle differentiated as an ixotrichodermium of tangled hyphae, incrusted. Stipe cuticle with caulocystidia similar to the hymenial cystidia. Clamp connections absent.
Chemical reactions unknown.
Habit, habitat, and distribution Solitary to gregarious in soil under conifers. A single collection of this species has been made in the vicinity of Donner Pass in Nevada County. It is most probably associated with lodgepole pine, but the basidiocarps were collected in a mixed conifer forest. The pines, however, were dominant, and the basidiocarps were closer to them than to other conifers.
Material studied Nevada County: Sundberg 351.
Observations This Suillus, originally described from collections made in the state of Washington, rather closely resembles Suillus granulatus but is readily distinguished by the noticeable boletinoid arrangement of the tubes and pores, which occur in distinct rows radiating from the center of the pileus. The white context that, so far as is known, does not change to yellow with age is another distinctive feature. Some basidiocarps of S. punctatipes have the stature of S. brevipes, but their stipes are usually noticeably punctate, at least in the upper portion.
The Boletes of California
Copyright © 1975 by Dr. Harry D. Thiers
Additional content for the online edition © 1998 by Michael Wood, Fred Stevens, & Michael Boom
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