Sticky bolete or Slippery jack

The cap of the sticky bolete reaches 4 to 10 centimeters across. When young it is convex and hemispherical, and with age it opens out to cushion-shaped and flat. The cap surface is very slimy and sticky, especially in wet weather, which is how the mushroom got its name. The coloring is subdued and variable, from dirty gray and gray-brown to olive-gray and pale clay, often with darker streaks or spots. The slimy skin peels off easily, revealing a paler surface.

Cap 4–12 cm across, convex in young mushrooms, later flattened-convex. The surface is covered with a thick layer of slime — especially in wet weather. Color chocolate-brown or chestnut, yellowish brown when dry. The margin often bears remnants of the partial veil.

Under the cap is a layer of tubes with relatively large, angular and irregular pores, larger than in other Suillus species. They are dirty gray, grayish white or olive-tinged, which again sets this species apart from its golden-pored relatives. When pressed or damaged, the pores slowly take on a blue-green or brownish tint. In young mushrooms the pore surface is covered by a veil, the remains of which form a ring on the stem.

The hymenophore has tubes. Pores yellow, small, regular, turning yellow-green with age. The tubes are attached to the stem or run slightly down it. When pressed, the pores turn slightly brownish.

The stem of the sticky bolete is cylindrical, 4 to 8 centimeters tall, grayish white or pale gray. Near the top it has a noticeable slimy ring left by the veil; above it the surface is paler, and below it is covered with small grayish glandular dots. When touched, the stem may also slowly take on a bluish-green tint. There is no volva. The combination of gray tones, the ring and the link to larch reliably identifies this species.

Stem 5–10 cm tall, 1–2 cm thick, solid, cylindrical. Yellow and granular in the upper part, brown or violet-brownish below the ring. A characteristic purple-brown membranous ring — a remnant of the partial veil and one of the key diagnostic features of the species.

The flesh of the sticky bolete is whitish or grayish, fairly soft and watery, especially in mature mushrooms. Its characteristic trait, reflected in its folk name, is a slow color change in the air: when cut, the flesh gradually takes on a blue-green and sometimes pinkish-brown tint. The taste is mild, with no noticeable bitterness, but overall rather bland. Because of the watery texture and mediocre flavor, mostly young, firm specimens are chosen for the table.

Flesh yellowish or pale cream, firm in young mushrooms, softer in mature ones. Turns slightly pink when cut or stays unchanged. The taste is mild, pleasant, slightly sourish. The cap skin peels off easily together with the slime.

The smell of the sticky bolete is weak and nondescript, typically mushroomy, with no sharp or unpleasant notes. Aroma is not a defining feature, so for identification rely on the gray slimy cap, the large grayish pores, the ring on the stem and growth next to larch.

Smell pleasant, unobtrusively mushroomy, slightly resinous — reflecting its symbiosis with pine. With cooking the aroma intensifies and becomes more pronounced. No foreign unpleasant notes.