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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)

Slippery jack

Suillus luteus

EdibleExpert-verified
Orange webcap (Cortinarius mucosus)

Orange webcap

Cortinarius mucosus

InedibleExpert-verified

📊 Comparing characteristics

Comparison of characteristics: Slippery jack and 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

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

May – October

Orange webcap

Fruiting season

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

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

Conifer forestMixed forest

Orange webcap

Conifer forestMixed forest

👀 Similar mushrooms — don't mix them up!

❓ Frequently asked questions

Can Slippery jack and Orange webcap 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 Slippery jack from Orange webcap?
The main differences: season: Slippery jack — spring, summer, autumn, Orange webcap — summer, autumn; use: Slippery jack — culinary, pickling, drying, freezing, Orange webcap — not eaten; cap color: Slippery jack — brown, chestnut, Orange webcap — brown, dark brown. As for edibility: Slippery jack is edible, Orange webcap is inedible. The full table of characteristics is higher up on this page.
Is Orange webcap edible?
Orange webcap — inedible.
When do Slippery jack and Orange webcap grow?
Slippery jack — May–October; Orange webcap — August–October.

Sources

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