Cap: 5-20 cm across, hemispherical when young, later plano pulvinate, dull surface, velutinous, clay-colored, light brown, margin acute, somewhat obtuse in age and retracted from the tubes.
Hymenophore: yellowish, bluing when touched, tubes notched at the stem.
Spore print: olive brown
Spore: fusiform to elliptic, 8(10)-12(15) x 3,6-4,4(5) μm
Stem: 5-15 x 2-6 cm, cylindric to bulbous ventricose, thickend toward the base, yellow toward the apex, red downward, upper part with pale to brownish net, solid, flesh firm.
Flesh: firm, yellowish, red brownish underneath, bluing if cut, bitter taste, odor insignificant.
Habitat: in hardwood and coniferous forests, on nutrient poor acid soil, grows from summer to fall.
Remarks: could be changed with Boletus satanas that doesn't have yellow hymenophore.