Sepia boleteXerocomellus porosporus

Yes. Bluing when cut is a normal reaction in many boletes (Xerocomellus boletes, Gyroporus cyanescens, lurid boletes). It is not a sign of toxicity, just pigments oxidizing. The blue color disappears with cooking.

Among Xerocomellus and related boletes in Ukraine there are almost no dangerous look-alikes. Just avoid mushrooms with RED pores (Rubroboletus) — among them is the devil’s bolete. The sepia bolete has yellow pores — safe.

Broadleaf and mixed woods with oak, hornbeam and beech. Throughout the forest zone and the Forest-Steppe. Single specimens, never abundant. Less common in conifer forests.

Summer and fall, peaking in August–September. In very dry years it turns up less often. Like all these boletes, it gets active after heavy rain.

Honestly — in the field it’s very hard to tell them apart. Both have cracked caps, both have a yellow pore surface, both turn blue. Porosporus is darker on average and has an apical pore in its spores (visible only under a microscope). For everyday foraging you don’t need to tell them apart — both are safe and both are of middling quality.

Mainly oak, beech and hornbeam. Moderately warm woods. Less common in northern regions. Almost absent from pure conifer forests.

Clean and slice. Boil for 5–10 min and discard the first water (to make it less watery). Fry with onion as part of a mushroom mix — on its own it’s bland. You can dry it, but the aroma is weak. Pickling — the watery texture doesn’t hold its shape.

For the ordinary forager — no. As a culinary mushroom — middling. As a collector’s find for those studying the genus Xerocomellus — interesting. Most foragers gather all these boletes together without sorting them into species — and that’s a perfectly fine strategy.