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Suillus bovinus, commonly known as the Bovine Bolete or Jersey Cow Mushroom, is a widespread edible mushroom in the family Suillaceae. It is characterized by its slimy, yellowish-brown to orange-brown cap, yellowish pores that often stain greenish-blue when bruised, and a relatively slender stem. It forms a mycorrhizal association primarily with pine trees.
How to Identify
- Cap
- The cap is typically 4-12 cm (1.5-4.7 inches) in diameter, convex to broadly convex or nearly flat in maturity. The color ranges from yellowish-brown to orange-brown, sometimes with olive or reddish tints. The surface is distinctly slimy or viscid when moist, becoming shiny when dry. The margin is often incurved when young, becoming wavy or irregular with age. The cuticle is easily peelable.
- Gills
- Instead of gills, Suillus bovinus has a pore surface. The pores are angular, large, and radially elongated, appearing somewhat labyrinthine or maze-like, especially near the stem. They are initially yellowish, becoming olive-yellow to brownish-yellow with age, and often stain greenish-blue or brownish when bruised. The tubes are decurrent (running down the stem) and concolorous with the pores.
- Stem
- The stem is 3-10 cm (1.2-3.9 inches) long and 1-2 cm (0.4-0.8 inches) thick, cylindrical or slightly tapering towards the base. It is solid, yellowish to brownish, often paler than the cap, and lacks a ring (annulus). The surface can be smooth or finely granular, sometimes with reddish-brown streaks or dots, especially towards the base.
- Flesh
- The flesh is pale yellow to yellowish-white, soft, and often stains faintly pinkish or bluish when cut or bruised, especially in the stem base. It has a mild, sometimes slightly fruity odor and a mild taste.
- Fruiting body
- The fruiting body is a typical bolete shape, consisting of a cap and a central stem. It is generally medium-sized.
- Habitat
- Suillus bovinus is mycorrhizal, forming a symbiotic relationship exclusively with pine trees (Pinus species). It is commonly found growing solitarily or in scattered groups on the ground in pine forests, plantations, and heathlands where pines are present. It prefers sandy or acidic soils.
Key Facts
- Cap surfaces: Viscid/slimy when moist, shiny when dry, easily peelable cuticle
- Growth Form: Solitary to scattered or gregarious
- Spore Print: Olive-brown to yellowish-brown
- Body color: Yellowish-brown to orange-brown cap, yellowish pores, yellowish stem
- Odor: Mild
- Flesh bruises: Faintly pinkish or bluish, especially in stem base
- Height: 3-10 cm (1.2-3.9 inches)
- Cap Diameter: 4-12 cm (1.5-4.7 inches)
- Nutrient gathering: Mycorrhizal
Safe
SafeSuillus bovinus is generally considered edible, though its texture and flavor are often described as mediocre. Some individuals may experience mild gastrointestinal upset if consumed raw or in large quantities, or if they have a sensitivity to boletes. Always cook thoroughly. There are no known deadly toxic look-alikes within the Suillus genus, but proper identification is crucial to avoid other potentially toxic boletes.
Quick Check
- Odor: Mild, sometimes slightly fruity
- Fruiting: Late summer to autumn
- Substrate: Ground, mycorrhizal with pine trees
Where to Find
Europe
Widespread across Europe, particularly common in pine forests from Scandinavia to the Mediterranean.
North America
Found in North America, especially in areas with introduced or native pine species.
Asia
Reported in parts of Asia where pine forests are prevalent.
Australia and New Zealand
Introduced to these regions along with pine plantations.
Finding Tips
Pine Association
Always look for Suillus bovinus in association with pine trees. If there are no pines, it's likely not this species.
Moist Conditions
The cap is typically slimy when moist, making it easier to identify after rain or in humid conditions.
Pore Examination
Pay close attention to the large, angular, and often labyrinthine pores, which are a key distinguishing feature.
Bruising Reaction
Observe if the pores or flesh stain greenish-blue upon bruising, though this reaction can be subtle.
Seasonal Timing
Fruiting typically occurs from late summer through autumn, depending on local climate and rainfall.
Similar Species
Slippery Jack
Suillus luteus
Also known as: Pine Bolete
Larch Bolete
Suillus grevillei
Also known as: Elegant Bolete
Weeping Bolete
Suillus granulatus
Also known as: Granulated Bolete
Scientific Classification
- Phylum
- Basidiomycota
- Class
- Agaricomycetes
- Order
- Boletales
- Family
- Suillaceae
- Genus
- Suillus
Storage Information
- Max Temperature: 4°C
- Freezing duration: 6 months
- Min Temperature: 0°C
- Refrigeration: 5 days
How to Clean
Due to its slimy cap, it is recommended to peel the cap cuticle before cooking. The pores can also be removed if desired, as they can become mushy when cooked. Wipe the stem clean with a damp cloth or brush.
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