Caloboletus rubripes, of unknown edibility, differs most obviously in that the flesh and pores bruise blue. In addition, the stem differs by being reddish at the base, yellowish at the apex, and lacking reticulation. The edible
Boletus regineus differs in that the cap is not heavily fibrous and the stem is whitish.
See also
Boletus edulis,
Boletus rex-veris, and
Butyriboletus persolidus .