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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.

A whole larch bolete (Suillus grevillei) in hand, side view: yellow pores, a dark ring and a pale fibrous stem

Larch bolete

Suillus grevillei

EdibleExpert-verified
Slippery jack (Suillus luteus)

Slippery jack

Suillus luteus

EdibleExpert-verified

📊 Comparing characteristics

Comparison of characteristics: Larch bolete and 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

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

June – October

Slippery jack

Fruiting season

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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

Conifer forestMixed forest

Slippery jack

Conifer forestMixed forest

👀 Similar mushrooms — don't mix them up!

❓ Frequently asked questions

Can Larch bolete and Slippery jack be mixed up?
Yes, they look so similar that people often mix them up. The season, use, cap color help tell them apart.
How to tell Larch bolete from Slippery jack?
The main differences: season: Larch bolete — summer, autumn, Slippery jack — spring, summer, autumn; use: Larch bolete — cook fresh, pickling, drying, salting, Slippery jack — culinary, pickling, drying, freezing; cap color: Larch bolete — yellow, orange, Slippery jack — brown, chestnut. The full table of characteristics is higher up on this page.
Is Slippery jack edible?
Slippery jack — edible.
When do Larch bolete and Slippery jack grow?
Larch bolete — June–October; Slippery jack — May–October.

Sources

  • [1]Вікіпедія (українська)
  • [2]Атлас грибів України, Зеров Д.К. (1979)
  • [3]MycoBank Database
  • [4]Index Fungorum
  • [5]GBIF
  • [6]iNaturalist Ukraine