About
Slippery jack (*Suillus luteus*) is a bolete with a brown cap and a sticky skin. It is gathered in coniferous woods in late summer and autumn.
Fresh harvest season
An orientation window for local open-field harvest in the regions already documented in the atlas — not retail, import, or storage availability.
Atlas regions summary: August 1 – September 30
Regions with data: Moscow Oblast
In the kitchen
Slippery jacks are fried and stewed, added to soups, and pickled. The sticky skin on the cap is usually peeled before cooking.
Seasonality by region
Moscow Oblast(RU-MOS)
Season: August – September; Beginning; Active; Ending BeginningActiveEnding
- Season
- August – September
- Confidence
- Approximate
Evidence
Late slippery jack (Suillus luteus), not the umbrella “butter mushrooms”. Gorlenko et al. 1986: “Maslenok pozdnii” middle-belt row is August–September (monthly table). Start 1 August and end 30 September encode that window. Fedorov 1990 (S. luteus account, June–October) is corroboration of species identity and a broader envelope only; his June start and October end are not carried into the canonical period. Peak unset. Karelia and other oblasts are not copied.
Sources
Gorlenko M.V., Garibova L.V., Sidorova I.I. — Vsyo o gribakh
Gorlenko 1986: “Maslenok pozdnii” is marked August–September for the middle belt. The same row supplies both bounds of the canonical 1 Aug–30 Sep window (unique slug per period → one structured row; September END is fixed in evidenceNotes).
Species accounts: aspen bolete, birch bolete, autumn honey fungus (Fedorov, 1990)
Fedorov F.V. — Griby
Fedorov 1990: Suillus luteus account (June–October) corroborates species identity and a broad seasonal span. Not used to open START in June or END in October against the Gorlenko table.
