Charcoal burnerRussula cyanoxantha

The charcoal burner (Russula cyanoxantha) — one of the best and most popular edible brittlegills in Europe, and alongside R. vesca the flagship of the genus. The Latin epithet cyanoxantha comes from the Greek kyanos — "blue" and xanthos — "yellow" — a nod to the remarkably variable cap color: from violet-blue through green-gray to brownish violet with yellow and olive patches. Folk names include "Madame Green" for its mostly green-violet tones.

Its main unique diagnostic feature — the gills are soft, springy and flexible, bending without breaking when pressed. In all other brittlegills the gills are brittle and crumbly, as in the fragile brittlegill. R. cyanoxantha is the only brittlegill with flexible, springy gills you can run your finger across without breaking them. It is an entirely distinctive trait that lets you recognize the species from your very first encounter.

Cap 5-15 cm across, fleshy, convex to flattened with a slightly depressed center, variable in color — violet-blue, green-gray, olive-violet, brownish violet with yellow patches. The color is so diverse that older descriptions long split the species into 4-5 separate species, until molecular phylogenetics showed they are variations of one.

Excellent culinary quality — the flesh is tender, very tasty, with no bitterness and a characteristic nutty note. Cook it like porcini: fry, stew, pickle, dry. No preliminary boiling required. Foragers prize it as one of the finest brittlegills.

Diagnostic features of Russula cyanoxantha: Flexible, springy gills (the only one in the genus!) — the key feature Variable cap color with violet-green dominating Spore print white Flesh pure white, does not change when damaged Taste mild, sweetish and nutty (tongue test) Smell faint, pleasant, neutral-fruity FeSO₄ test: NEGATIVE or very weak (sets it apart from other Russula) Grows in deciduous and mixed forests (beech, oak, birch, hornbeam, spruce)

The main risk is confusing it with a young death cap (Amanita phalloides) because of the green-violet palette. Dig up the stem base: no sac/ring — it's a brittlegill. Plus, R. cyanoxantha has flexible gills (the death cap's are ordinary and brittle).

In Ukraine Russula cyanoxantha is common in deciduous and mixed forests: the Carpathians, Prykarpattia, Polissia, the forest-steppe. A mycorrhizal partner of beech, oak, hornbeam and birch. Season July — October.