Dmitar posted this for observation 8871.

The five rules of collecting Boletes:

1) SPORE PRINT COLOR – please always make a careful observation of
that – this does the HEAVY LIFTING down to Genus for you. PINK,
CINNAMON, OLIVE, etc. Then you know whether’ you’re dealing with
Tylopilus, Leccinum, Boletus and so forth…

2) DISCOLORATION reactions – observe carefully
a) On sponge
b) On stipe
c) On context

3) TASTE – some Tylopili (mainly) are bitter. This can be a
huge factor when comparing similarly looking brownish/tan species.

4) MACROCHEMICAL reactions – you don’t need much. Just NAHO4 and
KOH do most of the heavy lifting in this group. Use them, make
notes and photos.

5) SLICE them – other than the context discoloration, in the case
of Gyroporus you may see a hollow stipe – that does your id right
there…