Cap: 6-20 cm across, brown to red, hemispherical when young, later pulvinate to plane, smooth surface, dull, margin even, acute.
Hymenophore: olive yellow when young, later orange red to red, yellow to yellow olive tubes, cup surface beneath the tubes is orange red.
Spore print: olive brown
Spore: elliptic, 12-14,1 X 5-6(6,3) μm
Stem: 4-15 x 1-5 cm, bulbous when young, later cylindric ventricose, with tapering base, upper half yellowish to red yellowish, longitudinally streched, lower part purple to reddish and often covered with the net, flesh yellowish, purple reddish toward the base, fibrous.
Flesh: pale yellow, bluing when cut, later fading, compact when young, later soft and spongy, thick, odor pleasant, mild taste.
Habitat: in hardwood and coniferous forests as well as in parks, on calcareous soils, grows from summer to fall.
Edibility: edible only cooked, do not use water where it was cooked!
Remarks: can be confused with Boletus erythropus, only it has stem covered with net.