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Birch bolete (Leccinum scabrum and closely related birch Leccinum) is a tube mushroom with a brown to grey-brown cap and a pale stem covered in dark scabrous scales. The flesh is pale; in older specimens it soon becomes soft and watery. It forms mycorrhiza with birch in mixed and deciduous woods. Everyday “подберёзовики” often cover several Leccinum species; the catalog keeps a culinary product with L. scabrum as the reference taxon.
Birch boletes are fried and stewed, added to soups and sauces, dried and pickled. Young firm specimens are preferred: mature flesh quickly turns spongy. The flesh often darkens when cooked — a normal culinary trait, not a sign of spoilage.
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Birch bolete. Shubin 1976: June–October, often abundant; 1st layer (second half of June) is short and few. Start 21 June; end 30 September. Moscow is not copied, and the interval does not open on 1 June. No explicit peak: available sources do not justify a narrower window without false precision.
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Birch bolete. Smirnyakov 1992: first finds in late May, mass June–July, abundant August to early September. Gorlenko 1986: June–September only. Fedorov 1990: end of May to late autumn. Start 1 June and end 30 September follow Gorlenko’s months; May first-finds and Smirnyakov’s October are omitted from the typical harvest. No explicit peak: available sources do not justify a narrower window without false precision.
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Birch bolete. 2015: Leccinum scabrum June–September, very frequent. Start 15 June; end 30 September. Karelia and Moscow are not copied. No explicit peak: available sources do not justify a narrower window without false precision.
Mushrooms of the northern forests (Shubin, 1976): layers and months for Petrozavodsk latitude
Shubin V.I. — Griby severnykh lesov, 3rd ed., Petrozavodsk: Karelia
Layer calendar compiled for Petrozavodsk latitude (not Leningrad Oblast): 1st layer second half of June, short and few; 2nd 1st–2nd decades of July; 3rd from 2nd decade of August through October, often peaking in September. Same-book species accounts: chanterelle July–October; birch and aspen bolete June–October; true milk cap July–September (black milk cap separate); saffron milk cap July–October; autumn honey fungus abundant about two weeks, usually first half of September (1968 early August is an exception). Summer honey fungus June–August is not this product. Porcini is not modelled from this row (1986 monograph). Catalog morel (Morchella) uses a separate source row; April–May Gyromitra is not that product.
Mushroom-picker calendar for the central oblasts of European Russia (Smirnyakov, Koshcheev, 1992)
Smirnyakov Yu.I., Koshcheev A.K., Koshcheev A.A. — Sputnik gribnika
Appendix: decade calendar (May–October). Legend: 0 first fruiting bodies, “-” mass growth, х abundant fruiting, = warm autumn only. Does not name Moscow Oblast separately; “central oblasts” is the belt that includes it. A handbook, not a multi-year plot study.
Gorlenko M.V., Garibova L.V., Sidorova I.I. — Vsyo o gribakh
Monthly presence table (April–October) for the middle belt. Chanterelle VII–IX; porcini VI–X; birch bolete VI–IX; aspen bolete VI–X; autumn honey fungus IX–X (summer honey fungus is a separate VI–X row). No intra-month dates and no named oblast.
Species accounts: aspen bolete, birch bolete, autumn honey fungus (Fedorov, 1990)
Fedorov F.V. — Griby
Aspen bolete: second half of June to October. Birch bolete: end of May to late autumn. Autumn honey fungus (Armillariella mellea): late August or early September until stable frosts. The spruce porcini form (late July–third decade of August) is not all porcini. Geography is USSR/Russia forests, not the three MVP oblasts.
Macromycetes of Nizhnesvirsky Reserve (Stolyarskaya et al., 2015)
Zmitrovich I.V., Stolyarskaya M.V. et al.; ed. Stolyarskaya M.V. — St Petersburg, ISBN 978-5-4386-0925-4
Annotated list of 806 species, north-east Leningrad Oblast (Lodeynopolsky District, middle taiga), not the whole subject and not the Karelian Isthmus. Chanterelle June–October, very frequent; porcini and pine porcini June–October; birch bolete June–September, very frequent; aspen bolete July–September; northern honey fungus (Armillaria borealis) August–September, layer usually short; saffron milk cap August–October, rather rare (1993 plot layer 2–15 October); true milk cap July–September. Morel is rare; 28 June 1993 mass on a burn is not a typical oblast harvest. Shubin’s Karelian calendar and Moscow handbooks are not copied.