Family: Pigs (Paxillaceae).
Synonyms: gyropore blue, gyropore birch.
Below will be a description and photo of the bruise fungus, which will help identify it in natural conditions.
Description. The hat is 5-15 cm in diameter, convex at a young age, then flat, whitish or brownish-yellowish to brownish-grayish, fluffy-felt, turns blue when touched.
The flesh is thick, white, quickly turns blue on the cut, without much taste and smell. The tubular layer is white, later straw-yellow or creamy-ocher, finely porous, instantly turning blue when touched. Leg 6-10 X 1,5-3 cm, tuberous, at first dense, then loose, hollow (or with several large cavities), usually of the same color as the cap. Turns blue when touched.
Mushroom bruise (see photo above) found throughout Our Country in the temperate and southern forest zone (deciduous and mixed forests), forms mycorrhiza with oak, chestnut, pine and birch, prefers sandy soil. Fruiting from July to October.
Medicinal properties: A pigment substance boletol (a derivative of purpurin-carboxylic acid) with antibiotic activity was found in the bruise.
Application in cooking: Used fresh, suitable for drying and pickling.