Boletus or Xerocomellus? I have been trying to identify a mushroom I collected in the nearby forest, and while I think I have it identified, it seems to have a couple of names and I am confused about which grouping is correct. According to one site, the mushroom is Boletus Chrysenteron : According to Wikipedia it is Xerocomellus Chrysenteron (picture on right) < But the info suggests that this Xerocomellus group is relatively new and belongs to the family Bolataceae. Are these two different mushrooms (Xerocomellus Chrysenteron and Boletus Chrysenteron)? Or is it that the mushroom is now in a new group?

As you will see in the Species section of the Wikipedia _Xerocomellus_ genus page you linked, _Xerocomellus chrysenteron_ has a basionym (original name) of _Boletus chrysenteron_. The _Xerocomellus_ genus was first described in 2008. The Wikipedia page for the _X. chrysenteron_ species similarly gives three synonyms for _X. chrysenteron_ in the box at the top; among them is _Boletus chrysenteron_ Bull. (1789). Thus the two names are referring to the same mushroom species.

One should note that Wikipedia says about this species:

> Macroscopic observation of Xerocomellus chrysenteron is not sufficient to determine this species with certainty, as many intermediate forms occur between it and other taxa

It appears from this that correct identification of a mushroom as being _X. chrysenteron_ is not a trivial task.