How to tell Pine bolete from Devil's bolete

Cap 8–20 cm (sometimes up to 30), hemispherical with a whitish margin in young mushrooms, later flattening to cushion-shaped. Color wine-red, dark chestnut-red, darker at the center and reddish toward the edges. The skin is matte, slightly sticky in wet weather and finely fibrous in dry weather. Whitish patches — a bloom of mycelium — are sometimes visible.

Cap 8–30 cm across, massive, globular in young mushrooms, then cushion-shaped. Surface dry, matte, pale gray or grayish ocher, with no bright coloring — it contrasts with the red pores. In old mushrooms the cap is often blotchy.

Pore surface of tubes, free or notched near the stem. White when young, then yellowish, olive-green in mature mushrooms. Pores small and round. Does NOT turn blue when pressed — a key feature of all four porcini.

Pored hymenophore. Pores bright red or blood-red — the mushroom's most noticeable feature. When pressed they turn blue very intensely and quickly. Tubes yellow or yellow-green near the stem.

Stem 8–15 cm tall, 3–7 cm thick, bulbous or club-shaped, hefty. Color brownish red-brown, darker than the cap in the lower part. Along its whole length runs a characteristic net of fine reddish ridges (as in the summer bolete B. reticulatus, but in the pine bolete the net is redder).

Stem 5–15 cm tall, 4–10 cm thick, massive, globular or barrel-shaped. Covered with a characteristic bright red net pattern on a yellow background — especially in the upper part. Turns blue when pressed.

Flesh white, very dense and heavy, does NOT change color when cut. Wine-red patches are sometimes visible under the cap skin. The texture is dry, with a pleasant resistance when cut. It is less often maggoty than the classic porcini.

Flesh yellowish, very firm, heavy. Turns blue in a flash when cut — the reaction comes within 3–5 seconds and is far more intense than in edible bluing species. In old mushrooms the flesh has an unpleasant smell.

The smell is richly mushroomy, with nutty and resinous notes. Dried, it keeps its aroma better than any other porcini species. The taste is mild, sweetish, not bitter.

In young mushrooms the smell is unobtrusive or absent. In mature mushrooms it is rather unpleasant, rotten or ammonia-like, especially noticeable in hot weather. The smell gets stronger when dried.