The hat. Diameter 5 - 15 (30) cm, fleshy, solid, rounded, with a thin edge; ear-shaped, shell-shaped or almost round. In young mushrooms, the cap is convex and with a curled edge; later, it is flat or shirokoronkovkovidnaya with a wavy or blade edge. The surface of the cap is smooth, glossy, often wavy. When grown in wet conditions, the cap of the mushroom is often covered with mycelial coating. The color of the cap is changeable, varying from dark blue or violet in young mushrooms to ashy gray with a violet tinge in mature mushrooms, and fading to whitish, grayish or yellowish over time. Leg. Short (sometimes almost invisible), dense, solid, eccentric or lateral, cylindrical, tapered towards the base, often curved, 2 to 5 cm long and 0.8 to 3 cm thick. The surface of the legs is white, smooth; brownish and slightly felt at the base. In old mushrooms, the leg becomes very stiff. Plate. Medium frequency and rare, 3 - 15 mm wide, thin, descending on the leg, near the leg with anastomoses (jumpers); young fungi whitish, yellowing or graying with age. Spore powder is white or pinkish. The flesh. White, dense, in young mushrooms, soft and juicy, later hard and fibrous (especially in the leg), without a pronounced smell. The taste is described as pleasant, with an anise taste, due to the presence of benzaldehyde. Beneficial features. Oyster blue stocking has hemostatic, emollient, enveloping effect. It improves intestinal motility, removes toxins, poisons, slags.