Fauna
Fungus

Slippery Jack

Suillus luteus

Also known as Sticky Bun, Slippery Jack Bolete

Slippery Jack forms vital mycorrhizal partnerships with pine trees, emerging abundantly in coniferous woodlands after autumn rains. Its distinctive brown cap is coated in a sticky gelatinous layer that protects developing spores from drying out. A prominent purplish partial veil leaves a durable ring high on the stem, helping distinguish it from closely related boletes.

FungusMycorrhizalForest Dweller
Slippery Jack reference1 / 7
(c) Davide Puddu, some rights reserved (CC BY), uploaded by Davide Puddu · cc-by
—observations
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Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & preyTree Carbohydrates, Soil Minerals
Predators
  • Fungus Gnats
  • Slugs
  • Squirrels
ThreatsDeforestation, Forest Clearcutting
HabitatsConiferous Forests, Pine Plantations
Life spanPerennial Mycelium (fruiting bodies last 5–10 days)
Classification
  1. OrderBoletales
  2. FamilySuillaceae
  3. GenusSuillus
  4. SpeciesSuillus luteus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Many edible mushrooms have toxic look-alikes; never eat wild fungi based on app identification alone.
Responsible observation
  • Identification: Look for the sticky brown cap, bright yellow pores, and distinctive purplish stem ring.
  • Ecology: Search near young pine trees in sandy soils, especially after heavy autumn rainfalls.
  • Spore Print: Place the cap face down on white paper to reveal a chocolate-brown print.
Related species
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