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Boletus erythropus, commonly known as the Red-mouthed bolete, is a robust, edible mushroom characterized by its velvety, dark brown cap, vivid red pores that bruise instantly dark blue, and a densely punctate (dotted) stem, often with an orange-red to reddish-brown coloration. It is a mycorrhizal fungus, typically found in association with deciduous and coniferous trees.
How to Identify
- Cap
- The cap is hemispherical to convex, flattening with age, measuring 5 to 20 cm (2 to 8 inches) in diameter. The color is typically dark brown, reddish-brown, or olivaceous-brown, with a finely velvety or suede-like surface texture, especially when young, becoming smoother with age. It does not crack or fissure extensively. The margin is often inrolled when young.
- Gills
- Instead of gills, this mushroom has a pore surface. The pores are small, circular, and initially vivid red or crimson, fading somewhat to orange-red with age. They bruise instantly and intensely dark blue or blackish-blue upon touch. The tubes are concolorous with the pores. The pore layer is depressed around the stem.
- Stem
- The stem is robust and solid, measuring 5 to 15 cm (2 to 6 inches) in height and 1.5 to 5 cm (0.6 to 2 inches) in thickness. It is typically cylindrical to club-shaped, often broader towards the base. The color is yellowish to orange-red or reddish-brown, densely covered with minute red to orange-red, granular or punctate (dotted) points or scales (scabrosities) against a yellow background. This gives it a 'red-dotted' appearance. It lacks a true reticulation (net-like pattern). The base of the stem often displays reddish or brownish stains. The extreme base may show a touch of crimson.
- Flesh
- The flesh is pale yellow to lemon-yellow. When cut or bruised, it rapidly stains dark blue to indigo, particularly in the cap and upper part of the stem. This bluing reaction is a key identifying feature.
- Fruiting body
- The fruiting body is stout and fleshy, typical of many boletes, with a distinct cap, pore surface, and stem.
- Habitat
- Typically found growing solitary or scattered in mixed deciduous and coniferous forests. It forms ectomycorrhizal associations with a wide range of trees, including oaks, beeches, birches, pines, and spruces. It prefers well-drained, acidic to neutral soils.
Key Facts
- Cap surfaces: Velvety, suede-like, smooth with age
- Growth Form: Solitary or scattered
- Spore Print: Olive-brown
- Body color: Dark brown cap, red pores, yellow flesh, reddish-dotted stem
- Odor: Mild
- Flesh bruises: Rapidly and intensely dark blue
- Height: 5-15 cm (2-6 inches)
- Cap Diameter: 5-20 cm (2-8 inches)
- Nutrient gathering: Ectomycorrhizal
Safe
Mild ToxicityBoletus erythropus is generally considered edible after thorough cooking. However, it is toxic if consumed raw or insufficiently cooked, causing gastric upset. Its edibility should not be confused with highly toxic look-alikes. There are no known specific toxins, but it's believed to contain compounds that are thermolabile and break down with heat. Extreme caution is advised due to potential confusion with genuinely toxic bluing boletes. ALWAYS cook this mushroom thoroughly.
Quick Check
- Odor: Mild, pleasant, mushroomy
- Fruiting: Late summer to late autumn (July to October)
- Substrate: Ground, in mycorrhizal association with deciduous and coniferous trees
Where to Find
Europe
Widespread across temperate and boreal regions of Europe, particularly common in central and northern parts.
North America
Known to occur in eastern North America, though some observations might refer to closely related species. However, it is considered widely distributed in the northern hemisphere.
Asia
Reported from parts of Asia, particularly in regions with similar forest types.
Finding Tips
Seasonality
Fruiting from late summer to late autumn, typically from July to October, depending on regional climate and rainfall.
Habitat Preference
Look for it under deciduous trees (especially oak and beech) and coniferous trees (pine, spruce) in well-drained woodland soils. It is often found along paths or at the edges of clearings.
Bluing Reaction
Always check for the rapid and intense dark blue staining of the flesh and pores upon bruising or cutting. This is a crucial identification feature.
Stem Punctations
Observe the distinctive red to orange-red punctations (dots) on the stem. This distinguishes it from species with a prominent reticulation.
Similar Species
Devil's bolete
Rubroboletus satanas
Also known as: Satan's bolete
Old man of the woods
Strobilomyces floccopus
Also known as: Strobilomyces strobilaceus
Boletus luridiformis
Boletus luridiformis
Also known as: Dotted stem bolete
Scientific Classification
- Phylum
- Basidiomycota
- Class
- Agaricomycetes
- Order
- Boletales
- Family
- Boletaceae
- Genus
- Boletus
Storage Information
- Max Temperature: 4°C
- Freezing duration: 6 months
- Min Temperature: 0°C
- Refrigeration: 5 days
How to Clean
Clean 'Boletus erythropus' with a soft brush to remove dirt and debris. Avoid washing with water if possible, as boletes can become waterlogged. If necessary, a quick wipe with a damp cloth is sufficient. Trim off any insect-damaged or overly bruised areas. It is recommended to cook these mushrooms thoroughly due to potential mild gastrointestinal upset if consumed raw or undercooked.
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