Larch bolete or Slippery jack
How they differ, how to recognize them and which is more dangerous — a mushroom comparison
The short answer
Larch bolete and Slippery jack are similar species that can be mixed up while foraging. The main visible difference: season: Larch bolete — summer, autumn, Slippery jack — spring, summer, autumn. The mushrooms also differ in the following features: use, cap color, cap shape.

Larch bolete
Suillus grevillei

Slippery jack
Suillus luteus
📊 Comparing characteristics
| Characteristic | Larch bolete | Slippery jack |
|---|---|---|
| Edibility class | Larch bolete Edible | Slippery jack Edible |
| Season | Larch bolete SummerAutumn | Slippery jack SpringSummerAutumn |
| Use | Larch bolete Cook freshPicklingDryingSalting | Slippery jack CulinaryPicklingDryingFreezing |
| Size | Larch bolete Medium (5–15 cm) | Slippery jack Medium (5–15 cm) |
| Cap color | Larch bolete YellowOrange | Slippery jack BrownChestnut |
| Cap shape | Larch bolete Convex | Slippery jack ConvexFlat |
| Cap surface | Larch bolete Slimy | Slippery jack Slimy |
| Taste | Larch bolete Mild | Slippery jack Mild |
| Smell | Larch bolete Pleasant | Slippery jack Pleasant, mushroomy |
| Flesh color change | Larch bolete Reddening | Slippery jack No change |
| Hymenophore | Larch bolete Pored | Slippery jack Pored |
| Stem | Larch bolete Central | Slippery jack CentralSolid |
| Ring (veil) | Larch bolete Ring present | Slippery jack Ring present |
| Volva | Larch bolete No volva | Slippery jack No volva |
| Substrate | Larch bolete Soil | Slippery jack SoilConifer needle litter |
| Nutrition type | Larch bolete Mycorrhizal | Slippery jack Mycorrhizal |
| Partner trees | Larch bolete Larch | Slippery jack Pine |
📅 Seasonality
Larch bolete
Fruiting season
June – October
Slippery jack
Fruiting season
May – October
🔬 Morphology
Cap
Larch bolete
Cap 4–10 cm (sometimes up to 15), hemispherical in young mushrooms, then cushion-shaped, almost flat in old ones. Color bright yellow, lemon-yellow, golden-orange, less often rusty brown. The surface is very sticky and shiny — in wet weather it looks literally lacquered. The skin peels off easily and often stretches into strips.
Slippery jack
Cap 4–12 cm across, convex in young mushrooms, later flattened-convex. The surface is covered with a thick layer of slime — especially in wet weather. Color chocolate-brown or chestnut, yellowish brown when dry. The margin often bears remnants of the partial veil.
Hymenophore
Larch bolete
Tubes adnate to the stem at first, then notched. Yellowish when young, later grayish- or olive-yellow. Pores small and angular. When pressed they turn pinkish, then brown — a characteristic reaction. In young mushrooms they are covered by a yellowish membranous veil.
Slippery jack
The hymenophore has tubes. Pores yellow, small, regular, turning yellow-green with age. The tubes are attached to the stem or run slightly down it. When pressed, the pores turn slightly brownish.
Stem
Larch bolete
Stem 4–12 cm tall, 1–3 cm thick, cylindrical or slightly widening toward the base. Yellow above, brownish below the ring, with small rusty dots. The ring is white or yellowish, membranous, and breaks down quickly — in mature mushrooms it’s often gone or only a narrow band remains.
Slippery jack
Stem 5–10 cm tall, 1–2 cm thick, solid, cylindrical. Yellow and granular in the upper part, brown or violet-brownish below the ring. A characteristic purple-brown membranous ring — a remnant of the partial veil and one of the key diagnostic features of the species.
Flesh
Larch bolete
Flesh yellow, soft, watery in mature mushrooms. When cut it turns slightly pinkish in the cap, and sometimes a bit greenish in the stem. The texture is slimy-fibrous.
Slippery jack
Flesh yellowish or pale cream, firm in young mushrooms, softer in mature ones. Turns slightly pink when cut or stays unchanged. The taste is mild, pleasant, slightly sourish. The cap skin peels off easily together with the slime.
Smell
Larch bolete
Smell faint, mushroomy, with a barely noticeable resinous note. Taste mild, not bitter.
Slippery jack
Smell pleasant, unobtrusively mushroomy, slightly resinous — reflecting its symbiosis with pine. With cooking the aroma intensifies and becomes more pronounced. No foreign unpleasant notes.
📍 Habitats
Larch bolete
Slippery jack
👀 Similar mushrooms — don't mix them up!
Slippery jack
EdibleWeeping bolete
EdibleBovine bolete
EdibleVelvet bolete
EdibleSuillus asiaticus
EdibleSuillus spectabilis
EdibleLarch woodwax
EdibleSuillus clintonianus
EdibleHollow bolete
EdibleSticky bolete
EdibleSlimy spike
EdibleRosy spike
EdiblePeppery bolete
InedibleLarch bolete
EdibleBay bolete
EdibleHerald of winter
EdibleSuillus flavidus
EdibleSuillus placidus
EdibleCopper spike
EdibleOrange webcap
Inedible❓ Frequently asked questions
Can Larch bolete and Slippery jack be mixed up?
How to tell Larch bolete from Slippery jack?
Is Slippery jack edible?
When do Larch bolete and Slippery jack grow?
Sources
- [1]Вікіпедія (українська)
- [2]Атлас грибів України, Зеров Д.К. (1979)
- [3]MycoBank Database
- [4]Index Fungorum
- [5]GBIF
- [6]iNaturalist Ukraine