Pores and Pore Surface
Pore surface whitish when young, pinkish at maturity, staining brown when bruised. Circular pores, 1-2 per mm.
Stipe adorned with brown reticulations on a cream or brownish background, at least in its upper part, but often over its entire length.
FLESH: few reactions, except with the phenol which blackens the flesh after 25 minutes. CAP-STIPE: towards yellow with KOH, NaOH and NH4OH on the stipe; to black with phenol; little change with FeSO4 and formalin. TUBES: to orange then black for KOH and NaOH; towards blackish gray for FeSO4, NH4OH and phenol; towards orange for formalin.
In the field, young Bitter Bolete are often confused with King Bolete by beginners; but what a disappointment at the moment of eating. The flesh is so bitter that this bolete is little parasitized by insects.
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