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Suillus collinitus, whole fruiting body
Holger Krisp · CC BY 3.0
Inedible

Suillus collinitus

Suillus collinitus · Suillaceae

Suillus collinitus is a pine-associated bolete with a chestnut to reddish-brown cap that is slimy when damp, yellow pores and no ring.

Last updated: Prepared by the Poros Mantar editorial team4 sources checkedReport a correction

FamilySuillaceae
SeasonMay, Aug–Jan
Spore printOchre-brown
Cap width4–11 cm
Stem length4–8 cm
Records in Turkey15 records
CultivationWild only
StatusInedible

Suillus collinitus is a pine-associated bolete with a chestnut to reddish-brown cap that is slimy when damp, yellow pores and no ring. The pink mycelium at the stem base is its clearest mark. Some sources say it is edible when well cooked, but the slimy cap skin can cause diarrhoea and allergic reactions in some people; our advice is not to eat it.

Also called: pink-based slippery jack Turkish: Beneklisünger mantarı Synonyms: Boletus collinitus, Suillus fluryi

Suillus collinitus, whole fruiting body

How to recognise it

Suillus collinitus, part by part

No ring or volva Spore print: Ochre-brown Mild and not distinctive; yellow flesh that does not change colour when cut.

Suillus collinitus, cap seen from above
Cap4–11 cm, convex then flattening; chestnut, reddish-brown to dark brown with fine radial fibres; very slimy when damp, shiny when dry.
Suillus collinitus, pores under the cap, seen from below
PoresSmall, angular, golden-yellow pores instead of gills, turning olive-yellow with age and not changing colour much when pressed.
Suillus collinitus, stem and stem base
Stem4–8 cm, yellow, browner towards the base; brown dots on the upper part and pink mycelium at the base.

When and where

May, Aug–Jan

  1. Janin season
  2. Feb
  3. Mar
  4. Apr
  5. Mayin season
  6. Jun
  7. Jul
  8. Augin season
  9. Sepin season
  10. Octin season
  11. Novin season
  12. Decin season

In mild climates it fruits from autumn into midwinter. Our Turkish records fall in January, May and August to December, mostly in October and December.

Type Inedible

Months seen JanuaryMayAugustSeptemberOctoberNovemberDecember

Colour BrownRed

Regions Black Sea RegionCentral Anatolia RegionMediterranean RegionAegean RegionMarmara RegionManisaIspartaSamsunAnkaraSakaryaBoluBursaIstanbul

Where does suillus collinitus grow?

It lives only with pines, such as Turkish red pine, Aleppo pine and black pine, mostly on calcareous soils, and is common in Mediterranean pine forests. It grows from soil singly or in groups.

Where is suillus collinitus found in Turkey?

Our map data (GBIF and iNaturalist) holds 15 Turkish records: 5 from Istanbul, 3 from Ankara, 2 from Manisa and one each from Sakarya, Isparta, Samsun, Bolu and Bursa. A specimen collected on the Bolu–Abant road also appears in a study published on DergiPark (Akkoyunlu et al., 2025, Anatolian Journal of Botany).

Which months

  1. Jan1
  2. Feb0
  3. Mar0
  4. Apr0
  5. May3
  6. Jun0
  7. Jul0
  8. Aug1
  9. Sep1
  10. Oct4
  11. Nov1
  12. Dec4

8 provinces, 15 observations (GBIF, iNaturalist); months from observation dates. Record density also reflects where observers work.

Latest suillus collinitus observations

On "illustrative" cards the image is a photo of the species; the observation photo cannot be shown here because of its licence, but can be seen at the source.

Suillus collinitus, in its natural habitat
In its habitat

Look-alikes

What could it be confused with?

Suillus collinitus can be mistaken for the species below. Each card shows the look-alike and how it differs from Suillus collinitus.

Suillus collinitus, whole fruiting body
This species Suillus collinitus
Weeping bolete (Suillus granulatus), whole fruiting body Edible species

not Suillus collinitus

Weeping bolete Suillus granulatus

Its closest look-alike; the cap is paler orange-brown, there is no pink mycelium at the stem base and young pores weep milky droplets.

Brown roll-rim (Paxillus involutus), whole fruiting body Deadly

not Suillus collinitus

Brown roll-rim Paxillus involutus

Its cap is also brown and sticky when damp, but it has gills running down the stem instead of pores, an inrolled cap margin and bruises brown.

Slippery jack (Suillus luteus) Edible species

not Suillus collinitus

Slippery jack Suillus luteus

It has a distinct membranous ring on the stem; Suillus collinitus never has one.

What it contains

Its culinary value is moderate to low; the flesh is soft and watery. Extracts of specimens collected in Turkey have been studied in the laboratory for antioxidant, genotoxic and antifungal effects; this does not mean any use in people.

General information, not a health claim.

Some sources say Suillus collinitus is edible when well cooked, but its slimy cap skin can cause diarrhoea and allergic reactions in some people, and boletes can be confused with poisonous species. Our advice is not to eat it. If poisoning is suspected, call poison control and keep any leftover mushroom.

Frequently asked questions

Is Suillus collinitus edible?

Our advice is not to eat it. Some sources say it is edible when well cooked, but the slimy cap skin can cause diarrhoea and allergic reactions in some people.

Is it poisonous?

It is not considered deadly; the main problems are that the slimy cap skin can upset digestion and that it can be confused with poisonous species.

What is the easiest way to recognise it?

Look for the combination of pine trees, a slimy chestnut cap, yellow pores, a ringless stem and pink mycelium at the stem base.

How does it differ from the weeping bolete?

The weeping bolete has a paler cap, its young pores weep milky droplets and it lacks the pink mycelium at the stem base.

Which trees does it grow under?

Only under pines, especially Turkish red pine, Aleppo pine and black pine, often on calcareous soil.

When does it appear?

From autumn into midwinter; most of our Turkish records are from October and December.

Does it change colour when cut?

No, its yellow flesh does not noticeably change colour when cut, unlike many boletes that turn blue.

Where is it found in Turkey?

Our map data holds 15 records from Istanbul, Ankara, Manisa, Sakarya, Isparta, Samsun, Bolu and Bursa.

When is suillus collinitus season in Turkey?

In our calendar, suillus collinitus season runs May, Aug–Jan. In mild climates it fruits from autumn into midwinter. Our Turkish records fall in January, May and August to December, mostly in October and December.

Where does suillus collinitus grow?

It lives only with pines, such as Turkish red pine, Aleppo pine and black pine, mostly on calcareous soils, and is common in Mediterranean pine forests. It grows from soil singly or in groups.

Where is suillus collinitus found in Turkey?

Our map data (GBIF and iNaturalist) holds 15 Turkish records: 5 from Istanbul, 3 from Ankara, 2 from Manisa and one each from Sakarya, Isparta, Samsun, Bolu and Bursa. A specimen collected on the Bolu–Abant road also appears in a study published on DergiPark (Akkoyunlu et al., 2025, Anatolian Journal of Botany).

What can suillus collinitus be confused with?

Suillus collinitus can be confused with weeping bolete (Suillus granulatus, edible species), brown roll-rim (Paxillus involutus, deadly) and slippery jack (Suillus luteus, edible species). Look-alikes are compared on this page.

What is suillus collinitus called in Turkish?

In Turkish, suillus collinitus (Suillus collinitus) is called Beneklisünger mantarı.

Related species

All species → · Identify by photo →

Sources

  1. Akkoyunlu, Dülger ve Dülger (2025), Anatolian Journal of Botany 9(1): 11-15: Evaluation of antifungal activities of the ethanolic extract of the macrofungus Suillus collinitus against dermatophytes dergipark.org.tr
  2. Wikipedia (EN): Suillus collinitus en.wikipedia.org
  3. iNaturalist: Suillus collinitus (Türkçe ad ve Türkiye gözlemleri) inaturalist.org
All sources (4)
  1. GBIF: Türkiye kayıtları gbif.org
Photo credits (9)