How to tell Yellow bolete from Devil's bolete

Cap 6–15 cm, hemispherical in young mushrooms, then cushion-shaped. Color bright yellow to ochre-yellow, with a reddish tinge in the center in mature ones. The surface is matte, slightly sticky in wet weather, and dry and faintly rough in dry weather.

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.

Hymenophore tubular, with a small notch near the stem. Yellow when young, olive-yellow in mature ones. Pores small, round, YELLOW (this sets it apart from its relative Neoboletus luridiformis, which has red pores). They quickly turn blue when pressed.

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 6–14 cm tall, 2–4 cm thick, bulbous or slightly club-shaped. Color bright yellow, with fine reddish dots and streaks, but WITHOUT a continuous red net (unlike N. luridiformis). Turns blue when pressed.

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 bright yellow, firm in young mushrooms. When cut, it turns blue QUICKLY and STRONGLY — the characteristic reaction of the genus Neoboletus. After 5–10 min it settles to a grayish blue. This is normal and not a sign of toxicity.

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.

Smell pleasant, mushroomy, with no distinctive notes. Taste mild and delicate, with a nutty hint.

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.