The large, edible fruiting bodies known as mushrooms appear under pine trees, generally in May to June.

It has a pinkish to brownish cap and its stem is often large and swollen, and the overall colour may have an orange-red tinge.

For many years, Boletus rex-veris was considered a subspecies or form of the porcini mushroom B. edulis.

[1] Phylogenetic analysis has shown B. rex-veris as a member of a clade, or closely related group, with B. fibrillosus, B. pinophilus, B. subcaerulescens, B. subalpinus, and B.

In Oregon it fruits at lower elevations, and its range continues into Washington, Idaho, and British Columbia.