Flesh changes colour when cut to blue, pink, red or brown
Partial colour change to pink, red or brown
Xerocomus tenax, Boletus tenax
In mixed pine and hardwood deciduous forests.
Dull brick-red to reddish brown with an olive tint, cracked in age.
Even, sometimes lobed or irregular at maturity.
Adnate, depressed near the stalk.
Pores and Pore Surface
Pore surface yellow at first, olivaceous, immutable or staining cinnamon-red or blueing when bruised or in age; pores circular to angular, 1-3 mm wide.
Whitish to yellowish or reddish, tapered downward.
Strongly reticulate on the upper part or all over the stalk.
Immutable or staining reddish-purple, sometimes yellow, above the tubes when cut.
FLESH: pale beige with KOH and NaOH; bluish gray with FeSO4 and formalin; gray with phenol; no change with NH4OH.
CAP-STIPE: beige with KOH, NaOH and NH4OH; grayish with FeSO4 and phenol; no change with formalin.