Slippery jack or Orange webcap
How they differ, how to recognize them and which is more dangerous — a mushroom comparison
The short answer
Slippery jack and Orange webcap are similar species: Slippery jack is edible, while Orange webcap is inedible. The main visible difference: season: Slippery jack — spring, summer, autumn, Orange webcap — summer, autumn. The mushrooms also differ in the following features: use, cap color, cap shape.

Slippery jack
Suillus luteus

Orange webcap
Cortinarius mucosus
📊 Comparing characteristics
| Characteristic | Slippery jack | Orange webcap |
|---|---|---|
| Edibility class | Slippery jack Edible | Orange webcap Inedible |
| Season | Slippery jack SpringSummerAutumn | Orange webcap SummerAutumn |
| Use | Slippery jack CulinaryPicklingDryingFreezing | Orange webcap Not eaten |
| Size | Slippery jack Medium (5–15 cm) | Orange webcap Medium (5–15 cm) |
| Cap color | Slippery jack BrownChestnut | Orange webcap BrownDark brown |
| Cap shape | Slippery jack ConvexFlat | Orange webcap Convex |
| Cap surface | Slippery jack Slimy | Orange webcap Slimy |
| Taste | Slippery jack Mild | Orange webcap Unknown |
| Smell | Slippery jack Pleasant, mushroomy | Orange webcap Odorless |
| Flesh color change | Slippery jack No change | Orange webcap No change |
| Hymenophore | Slippery jack Pored | Orange webcap Gilled |
| Stem | Slippery jack CentralSolid | Orange webcap Central |
| Ring (veil) | Slippery jack Ring present | Orange webcap Ring remnants |
| Volva | Slippery jack No volva | Orange webcap No volva |
| Substrate | Slippery jack SoilConifer needle litter | Orange webcap Soil |
| Nutrition type | Slippery jack Mycorrhizal | Orange webcap Mycorrhizal |
| Partner trees | Slippery jack Pine | Orange webcap Pine |
📅 Seasonality
Slippery jack
Fruiting season
May – October
Orange webcap
Fruiting season
August – October
🔬 Morphology
Cap
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.
Orange webcap
The cap is 5-10 cm across, hemispherical with an inrolled margin in young mushrooms, becoming convex to flat over time. The color is chestnut-brown, honey-brown, darker in the center, paler at the margin. The surface is very slimy in wet weather — a hallmark of the species. The cap skin peels off easily, as in a slippery jack. In dry weather the cap is simply shiny, without noticeable slime.
Hymenophore
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.
Orange webcap
The hymenophore is gilled — the gills are attached to the stem and moderately crowded. In young mushrooms they are pale cream to pale ochre, later turning rusty brown as the spores ripen. The spore print is rusty brown — a diagnostic feature of the genus Cortinarius. In young mushrooms the gills are covered by a cobwebby partial veil (the cortina).
Stem
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.
Orange webcap
The stem is 6-12 cm tall, 1-2 cm thick, cylindrical, long, often tapering toward the base. The color is whitish to cream, with reddish tints toward the base. The surface is smooth, slimy in the upper part, with fine lengthwise fibers. On the stem, remnants of the cobwebby cortina form a thin band dusted with rusty-brown spores.
Flesh
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.
Orange webcap
The flesh is firm, white to cream. When cut it does not change color. The smell is faint and neutral, with no distinctive notes.
Smell
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.
Orange webcap
Faint, neutral, mushroomy, with no pronounced notes.
📍 Habitats
Slippery jack
Orange webcap
👀 Similar mushrooms — don't mix them up!
Bovine bolete
EdiblePeppery bolete
InedibleWeeping bolete
EdibleLarch bolete
EdibleBay bolete
EdibleSuillus spectabilis
EdibleHerald of winter
EdibleSuillus clintonianus
EdibleSuillus flavidus
EdibleSuillus placidus
EdibleVelvet bolete
EdibleSticky bolete
EdibleCopper spike
EdibleOrange webcap
InedibleGoatcheese webcap
InedibleSlippery jack
EdibleCortinarius multiformis
Inedible❓ Frequently asked questions
Can Slippery jack and Orange webcap be mixed up?
How to tell Slippery jack from Orange webcap?
Is Orange webcap edible?
When do Slippery jack and Orange webcap grow?
Sources
- [1]Атлас грибів України, Зеров Д.К. (1979)
- [2]GBIF
- [3]Вікіпедія (українська)
- [4]MycoBank Database
- [5]Index Fungorum
- [6]iNaturalist Ukraine