Tylopilus felleus and Boletus edulis (porcini) look similar and are often confused.
However, they can be distinguished by the reticulation on the stalk;
in porcini, it is a whitish, net-like pattern on a brownish stalk,
whereas in Tylopilus felleus
it is a dark pattern on white. Porcini have whitish
pores while the other has pink.
If in doubt, as to the species taste a tiny bit of flesh.
Tylopilus felleus is strongly bitter while Porcini has a mild, more pleasant taste.
In light of evidence suggesting that up to 25% of people cannot taste some bitter compounds,
recommending a taste test to confirm the identification of some mushroom
is potentially dangerous. Although there have been no reports of illness or death from T. felleus,
I doubt anyone would recommend eating the same quantity
of it as many people eat Boletus edulis. (from Mushroom Expert.com)
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