Observation 74821: Boletus gertrudiae Peck

When: 2011-08-27

Collection location: Union Twp., Hunterdon Co., New Jersey, USA [Click for map]

Who: I. G. Safonov (IGSafonov)

No specimen available

This was my first time ever finding B. gertrudiae, if that’s indeed what it is. Not surprisingly, I initially misidentified it as B. nobilis, which I am more familiar with. My mistake became apparent upon conducting macrochemical tests — the pore surface immediately turned pinkish-red with ammonia, and the exposed context did not react with KOH the way one would expect from B. nobilis.


Staining of the pore mouths with ammonia (aq)
The context immediately following dissection
Left half: staining of the tubes with ammonia; the context is negative
Right half: reaction of the context with 3% KOH (aq) produces a weakly pinkish staining

Proposed Names

57% (1)
Used references: “North American Boletes” by Bessette-Roody-Bessette

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