Pores and Pore Surface
Pore surface dark brown at first, immutable or staining darke brown slowly; pores nearly circular, up to 3 per mm.
Whitish, staining gray-purple or gray-brown, sometimes blue, when cut, especially in the stipe.
FLESH: to gray with KOH, NaOH, FeSO4 and NH4OH; towards blackish with phenol and no change with formalin. CAP-STIPE: decoloring the cap with KOH, NaOH and NH4OH; towards black on the cap with phenol; gray on the stipe with all the reagents, except formalin which reacts very little.
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