Summary:
Features include 1) a dry smooth cap that is ochraceous to cinnamon to reddish brown, 2) whitish to pale yellow flesh that only rarely turns slightly bluish, 3) small round yellow pores that do not change when injured, 4) a yellowish stem that has tiny yellow scales but no reticulum and may have reddish or reddish brown tinges at the base, 5) growth under birch or other hardwoods, and 6) microscopic characters. Molecular data support segregation from Boletus as Hemileccinum subglabripes Halling. (Halling(6)).
Bessette et al. give the distribution as eastern Canada to FL, west to MN and TX, but it has also been reported from WA, ID, (H. Thiers 1986, pers. comm. to L. Norvell), and Smith(4) cite it as very rare in the Pacific Northwest. The eastern distribution specifically includes NS (Grund). There is a 2006 BC collection by M. Kranabetter at the University of British Columbia (as Boletus subglabripes).
Cap:
4.5-10cm, convex becoming broadly convex to nearly flat when old, sometimes broadly umbonate; "chestnut, ocher, cinnamon, or reddish brown"; "smooth to slightly wrinkled", (Bessette), 4.5-10cm, convex becoming broadly convex to flat-convex or broadly umbonate; yellow to ochraceous to clay color or more rarely dull cinnamon; dry to moist, bald, dull, often pitted or somewhat rugose [wrinkled], (Smith(35)), "light brown to rich cinnamon, yellow-brown, or reddish brown"; "dry, glabrous to slightly viscid when wet", (Phillips)
Flesh:
pale yellow to whitish, rarely turning blue slightly when cut or bruised, (Bessette), thick, up to 2cm, firm; whitish to pale yellow, occasionally irregular areas changing to olive-buff or greenish yellow when old where damaged, typically not changing when injured but rarely slightly bluish; in stem pale bright yellow except whitish in base, cortex sometimes staining reddish when old, (Smith(35))
Pores:
2 per mm, round, yellow when fresh, duller or slightly greenish yellow when old; tube layer 0.5-1.6cm thick, (Bessette), about 2 per mm, round, not stuffed when young; yellow, unchanging when injured; tube layer 1-1.5cm thick, deeply and broadly depressed around stem, yellow, (Smith(35))
Stem:
5-10cm x 1-2cm, nearly equal, solid; yellowish with occasional reddish or reddish brown tinges on lower part; "minutely scurfy with a thin coating of tiny yellow scales, dots, or points, not reticulate; partial veil and annulus absent", (Bessette), 5-10cm x 1-2cm, equal to ventricose, narrowing slightly toward top or base, solid; pale to bright yellow, occasionally with reddish stains at base; dry, furfuraceous to scabrous or fibrillose, never reticulate, (Smith(35))
Chemical Reactions:
flesh stains grayish olive-green with application of FeSO4 (Bessette)
Taste:
mild to slightly acidic (Bessette)
Microscopic:
spores 11-17 x 3-5 microns, narrowly fusoid [spindle-shaped], smooth, pale brown, (Bessette), spores 11-14 x 3-5 microns, narrowly fusoid, smooth, pale greenish yellow revived in KOH, yellowish in Melzer''s, wall less than 0.2 microns thick with no apical pore seen; basidia 4-spored, 18-26 x 8-10 microns, clavate, colorless to yellowish in KOH; pleurocystidia rare to scattered, 32-54 x 8-15 microns, fusoid-ventricose, smooth, thin-walled, apex acute, contents colorless to yellow revived in KOH, cheilocystidia numerous, 20-32 x 8-12 microns, fusoid to fusoid-ventricose, colorless to yellow in KOH; cap cuticle "a compact trichodermium the elements of which have the distal 2-5 cells inflated to sphaerocyst proportions and some so closely packed together as to produce a cellular layer, the cells (6)10-24 microns in diameter, more or less isodiametric and with yellow walls as revived in KOH or in Melzer''s"; stem cuticle has hymenium present in patches, caulocystidia 35-60 x 10-30 microns, soon colorless in KOH mounts, smooth, thin-walled, (Smith(35)), spores (11)12-14(17) x 3-3.5(5) microns, (Phillips)
Spore Deposit:
olive-brown (Bessette), olive to olive-ochraceous brown (Smith(35))
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