Caps are 2-10 cm across, convex, dry, hairy, rich brown to olive-brown, becoming cracked mosaic-like over the surface to expose the flesh (=aereolate). Flesh is cream to pale yellow, staining blue. Odour is pleasant, and taste is mild. Tubes and pores are lemon-yellow, with a greenish tinge, staining blue, ageing brown. Stalks are up to 12 cm tall by 1.5 cm wide, brown, with darker streaks. Spore prints are olive-brown. It fruits on the ground in mixed woods. Similar to Boletus chrysenteron but lacks red in the cracks of the cap and is distinguished microscopically by striate spores.