Boletus luridus - Hat up to 23 cm in diameter, yellow - orange, olive to brown - brown, sometimes with a pinkish tint, darkening when touched. In young hemispheric patients, in older people it can be almost flat, thick-grained. The surface is dry and smooth, sometimes suede or velvet to the touch. The skins can not be separated from the pulp. In places of feeding snails, it can take on a reddish color.
Long tubes (up to 20 mm), at the shank, cut, yellow-olive, blue.
Small, yellowish pores in young fruiting bodies, later orange-red, in old age olive. Siniejące.
Cylindrical shaft, broader at the bottom (especially young), full, up to 15 cm high. At the top, yellowish, deeper reddening, up to the carmine at the base. The whole surface is covered with a clear grid of red veins.
Flesh in the flesh-colored hat, at the base of the stem brown-red. A red wine streak can be seen above the tubes. When damaged, it immediately turns blue, and after some time turns gray. The taste is mild, the smell is poorly felt.
Occurrence: In deciduous and mixed forests, in parks, under beech and oaks, in summer and autumn, from June to October. Uncommon. He likes alkaline soils.
Value: Conditionally edible. Raw poisonous. Edible after cooking.