SUILLUS ALBIDIPES (Peck) Singer, Farlowia 2:45. 1945
Boletus albidipes Peck, N.Y. State Mus. Bull. 57:22. 1912.
(Not Boletus granulatus var. albidipes Peck, Ann. Rept. N.Y. State Mus. 54:168. 1901.)
Suillus albidipes (Peck) Snell, Mycologia 37:378. 1945.
Suillus granulatus ssp. albidipes (Peck) Snell and Dick, Mycologia 53:232. 1961.
Illustrations: See Microfiche No. 38
Smith, A. H., Mushroom Hunter's Field Guide, pl. 56a.
Smith, A. H., and H. D. Thiers, A Contribution Toward a Monograph of North American Species of Suillus, pl. 32.
Smith, A. H., and H. D. Thiers, The Boletes of Michigan, pls. 22, 23.
Snell, W. H., and E. A. Dick, The Boleti of Northeastern North America, pl. 20.

Pileus 5-12 cm broad when mature, convex becoming broadly convex to plano-convex to undulating and highly irregular in outline; surface glutinous to viscid; color white or pallid to pale vinaceous ("vinaceous-buff") when young, becoming vinaceous to brown ("vinaceous-cinnamon" to "cinnamon") and somewhat variegated or streaked when older; margin incurved, at first decorated by a dry cottony roll of whitish to vinaceous-buff material representing a false veil, which collapses and often disappears, but may form pallid patches along the margin in mature specimens. Context 1-2 cm thick, white, unchanging or slowly becoming yellow when exposed. Taste and odor not distinctive.

Tubes about 4-8 mm long, adnate, becoming adnexed to depressed, with drops of exudate, white to pale yellow ("ivory yellow") when very young, soon becoming yellow ("primuline yellow"); pores round, minute (▒three per millimeter), yellow, typically not staining or becoming pale vinaceous when bruised.

Stipe 3-8 cm long, 1-2.5 cm thick, equal, bulbous, or tapered or pinched at the base, solid; surface white at first and not glandular dotted, in age slowly yellow above and reddish brown below with very fine granular dots toward the base; no annulus. Context white to yellowish within, with age cortex of midportion reddish, bright yellow ("lemon chrome") above, dingy brown in the base, unchanging when exposed.

Spore print dull brown. Spores 6.6-8.8 X 2.5-3 Ám, thin-walled, greenish hyaline in KOH, yellowish in Melzer's, subellipsoid to ellipsoid in face view, oblong to obscurely inequilateral in side view, smooth, thin-walled.

Basidia 15-20 X 4-7 Ám, clavate, four spored, hyaline. Hymenial cystidia 26-35 X 8-11 Ám, clavate, brown in KOH, rare, clustered mostly near the pore, with dingy yellow brown incrusting pigment.

Tube trama divergent, hyaline in KOH, gelatinous in KOH. Pileus trama interwoven, homogeneous. Pileus cuticle differentiated as an ixotrichodermium, ochraceous in KOH and Melzer's, hyphae 3-6 Ám wide. Stipe cuticle with caulocystidia and caulobasidia. Clamp connections absent.

Chemical reactions KOH-context pink, then lavender; FeSO4-context gray.

Habit, habitat, and distribution Scattered to gregarious in humus under lodgepole pine. This species is known only from the Huntington Lake area in Fresno County and from the vicinity of Calaveras Big Trees State Park in Calaveras County.

Material studied Calaveras County: Thiers 21239. Fresno County: Thiers 13416,13444.

Observations As has been indicated by Smith and Thiers, there is considerable confusion concerning this fungus due to the fact that Peck used this name for two different fungi. In our concept the name should be restricted to those basidiocarps lacking an annulus but possessing a distinct roll of veil tissue on the pileus margin. Obviously, this species is closely related to S. granulatus, but the presence of a partial veil as indicated by the cottony roll on the margin of the pileus makes it distinct. This character is sometimes absent in old basidiocarps.

Suillus albidipes is somewhat similar to S. glandulosipes, which, however, is only associated with Bishop and beach pine. Also, S. glandulosipes shows prominent glandulae on the stipe during all stages of development and is not white when young. Suillus pungens, in the San Francisco Bay Area, might be confused with S. albidipes, but S. pungens has a very distinctive color pattern in the pileus as the basidiocarp develops, a harsh, unpleasant taste, larger spores, and is typically associated with Monterey pine.

Edible.

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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