Iodine bolete or Lurid bolete

The cap of this bolete usually reaches 5 to 15 centimeters across, although larger specimens up to 20 centimeters are sometimes found. When young it is perfectly hemispherical, opening over time to convex-flattened or almost flat, with an even, slightly inrolled margin. Its surface is strikingly matte, true velvet to the touch, and only in old age may become somewhat smoother. The cap's palette ranges from soft light brown and ochre-yellowish to the shade of freshly baked rye bread or a clay riverbank. Notably, the color stays fairly stable and does not change sharply with moisture.

The cap of the lurid bolete is large and fleshy, reaching 8 to 20 centimeters across. When young it is hemispherical, becoming convex and cushion-shaped with age. The cap surface is dry, finely velvety or felty to the touch, and slightly greasy-shiny in wet weather. The color is warm and variable — from olive-yellowish and gray-brown to ochre-brown and clay-colored, often with a pinkish sheen. When pressed, the cap surface darkens and develops blue-green spots, which instantly gives away the nature of this mushroom.

Under the cap hides a tubular hymenophore that forms a free or slightly notched zone right at the stem. The tubes and pores are very small and tightly packed. In very young mushrooms they are a soft pale lemon, which shifts to a rich bright yellow as the spores mature, and later to olive-yellowish. This hymenophore has one extremely important diagnostic feature: unlike many related species, it does not change color when pressed or damaged and does not turn blue at all, keeping its original sunny shade unchanged.

Under the cap lies a tubular hymenophore with bright, rich orange-red or blood-red pores that contrast sharply with the yellowish-olive tubes. It's these red pores that put the lurid bolete in the group of "dangerous-looking" boletes. At the slightest touch the pores instantly turn blue, flooding with a dark blue color. A characteristic microscopic feature of the species is a thin reddish layer between the tubes and the cap flesh, visible in a lengthwise cut.

The stem of the iodine bolete grows 5 to 15 centimeters tall and 2 to 5 centimeters thick. It is often cylindrical, but when young it can be noticeably widened toward the base, like a sturdy club. In the hand it feels very firm and massive. Its surface is pale yellow or lemon-colored, shading near the base into reddish-brown or even reddish tones. Unlike porcini, this stem has no characteristic net; instead it is slightly rough-fibrous and covered with tiny, barely visible dots. There is no ring or volva at all.

The stem of the lurid bolete is sturdy and massive, 8 to 15 centimeters tall, noticeably thickened or club-shaped and swollen at the base. Its main diagnostic feature is a distinct net pattern: a raised reddish net stands out clearly against a yellow-orange background, covering almost the entire surface of the stem. It's this red net that reliably distinguishes the lurid bolete from the scarletina bolete, whose stem is covered in separate dots rather than a net. When touched, the stem quickly turns blue. There is no ring and no volva.

The flesh of this mushroom is remarkably meaty, thick and firm to the touch. In the cap it stays whitish or pale yellow, while in the stem it turns distinctly bright yellow. The most important identification marker is its reaction to air: at a break or cut the flesh stays stable and does not change color; only very rarely, when badly damaged, may it take on a barely noticeable pinkish tone. The taste is pleasant, slightly sweetish, without any bitterness, which makes it an excellent ingredient after cooking.

The flesh of the lurid bolete is thick, dense and fleshy, lemon yellow in a fresh cut, and often wine-reddish near the base of the stem. Its most striking trait is rapid, vivid bluing on exposure to air: as soon as the mushroom is cut, the flesh floods with a thick dark blue color within seconds. This dramatic reaction is typical of the species and helps with identification. Raw flesh tastes mild, with no bitterness, but you absolutely should not taste it raw, because the uncooked mushroom is toxic.

The smell is the most interesting and most controversial feature of this species. A freshly cut mushroom, especially at the very base of the stem, gives off a distinct medicinal aroma most often compared to iodine or carbolic acid. This unusual "hospital" smell may seem off-putting when you're picking in the forest and is the reason many foragers have doubts. But don't worry: this chemical aroma is purely volatile. When heated, boiled or dried, the smell disappears completely, leaving only a classic, warm mushroom aroma behind.

The smell of the lurid bolete is faint, pleasant and gently mushroomy, sometimes with a barely noticeable fruity note. The aroma carries no warning and may even seem appealing, so don't rely on it for identification — the main guides remain the red pores, the red net on the stem and the rapid bluing of the flesh.