Boletus edulis

Caps are 10-20 cm across, hemispherical to convex, slippery when wet, smooth, ochre to red-brown. Flesh is white, not staining. Tubes are white, becoming yellowish, tinged with green, staining yellowish. Pores are tiny and round.   Stalks are up to 15 cm tall by 3 cm wide, with a bulbous base, white to ochre, and with net-like (=reticulate) markings especially near apex. Spore prints are olive-brown.  It fruits on the ground under conifers or in mixed woods. Edible.