How to identify Oiler Bolete

To correctly identify Oiler Bolete (Suillus granulatus), check each of these features in order. Misidentification is the most common cause of mushroom poisoning, so cross-reference multiple sources.

Step-by-step identification

1. 1

   Cap

   Shape, color, surface texture, and diameter.

   The cap is typically convex, smooth, and slimy to the touch, especially when wet. The color ranges from yellowish-brown to orange-brown. The cap surface is often sticky or glutinous.

2. 2

   Gills

   Attachment to stem, color, and spacing.

   Instead of gills, Suillus granulatus has pores on the underside of the cap. These pores are small, angular, and yellowish, becoming more brownish with age. They are easily separable from the cap flesh.

3. 3

   Stem

   Length, shape, surface, and any ring.

   The stem is cylindrical, yellowish, and covered with granules or glandular dots, especially towards the apex. It lacks a ring or annulus.

4. 4

   Flesh

   Color, texture, and bruising reaction.

   The flesh is soft and yellowish. It may have a slightly acidic or indistinct odor and taste.

5. 5

   Fruiting body

   Overall growth pattern.

   The fruiting body of Suillus granulatus is a mushroom with a distinct cap and stem structure, typical of boletes.

6. 6

   Habitat

   Where it grows and on what substrate.

   Suillus granulatus is commonly found in coniferous forests, particularly under pine trees. It forms mycorrhizal associations with the roots of these trees.

Key Facts

Cap surfaces

Slimy, smooth

Growth Form

Solitary or in small groups

Spore Print

Yellowish-brown

Body color

Yellowish-brown to orange-brown

Odor

Mild, slightly acidic or indistinct

Flesh bruises

Does not typically bruise

Height

4-10 cm

Cap Diameter

5-12 cm

Fruit body characteristics

• Gill attachment: Pores, decurrent to adnate
• Stem shape: Cylindrical
• Stem surface: Granular, dotted
• Ring: Absent
• Stem cross-section: Solid

Explore Oiler Bolete