LECCINUM ARMENIACUM Thiers, Mycologia 63:268. 1971
Pileus 8-11 cm broad, convex to obtusely convex when young, becoming broadly convex to plano-convex to highly irregular at maturity; surface often shallowly and irregularly pitted, viscid to subviscid, glabrous to obscurely tomentose to fibrillose; color near apricot to pink ("apricot orange" to pale "orange-buff"), not becoming darker with age; margin with conspicuous sterile cuticular flaps. Context 1-2.5 cm thick, white when first exposed, slowly and irregularly changing to pale fuscous in some areas, not changing in all parts. Taste and odor not distinctive.
Tubes 1-2 cm long, depressed, whitish to pale olive ("pale olive-buff") during all stages, staining pale lilac ("avellaneous") to flesh color ("testaceous") when bruised; pores up to 1 mm, angular, concolorous.
Stipe 8-12 cm long, 1.5-3 cm thick at apex, clavate, solid; surface dry, squamulose, ground color white, squamules white to pallid, never becoming strongly discolored with age. Context white, changing slowly to fuscous in apical portion, slightly bluish discoloration in base.
Spore print brown. Spores 11-14.5 X 3.8-5 Ám, subfusoid to subellipsoid, inequilateral, pale buff in KOH, pale ochraceous in Melzer's, walls smooth, thin.
Basidia 28-33 X 8-12 Ám, four-spored, hyaline, clavate. Hymenial cystidia 27-40 X 7-15 Ám, scattered to abundant, more numerous toward the pores, hyaline in KOH, fusoid to fusoid-ventricose with elongated, tapering apices, thin-walled.
Tube trama divergent from obscure central strand, hyaline in KOH, hyphae 5-7 Ám wide. Pileus trama interwoven, homogeneous, hyphae 6-10 Ám wide. Pileus cuticle differentiated as a trichodermium of tangled hyphal tips; hyaline in KOH, pale orange yellow in Melzer's; hyphae 8-12 Ám wide, no disarticulation of cells, pigment globules not formed when mounted in Melzer's, terminal cells only slightly differentiated. Caulocystidia 30-45 X 10-15 Ám, hyaline, clavate to subfusoid, rare large cells interspersed, numerous fertile basidia present. Clamp connections absent.
Chemical reactions KOH-context yellow in base of stipe; guaiac positive on surface of pileus and base of stipe.
Habit, habitat, and distribution Solitary to gregarious in soil under madrone. It is known from San Mateo and Santa Cruz counties.
Material studied San Mateo County: Thiers 18193, 26983. Santa Cruz County: Thiers 12034.
Observations This species is easily recognized by the pale-pink to apricot color of the pileus and the white scales on the stipe, which never become dark brown or black. Leccinum clavatum appears somewhat similar but is readily distinguished by its darker and more intensely colored pileus, smaller spores, the pale-lilac color of the pores when bruised, and a different mycorrhizal host.
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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