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Scarletina Bolete (Neoboletus luridiformis)

Scarletina Bolete

Toxic

Neoboletus luridiformis

Also known as: Boletus luridiformis var. discolor

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Description

Neoboletus luridiformis, commonly known as the Scarletina Bolete, is a striking mushroom characterized by its vibrant colors and distinctive features. It is a mycorrhizal fungus, forming symbiotic relationships with various trees, particularly broadleaf species. This bolete is appreciated for its culinary value, but caution is advised due to its potential toxicity when raw or undercooked.

How to Identify

Cap
The cap is convex to flattened, ranging from 5 to 15 cm in diameter. Its color is variable, often displaying shades of red, orange, or brown, sometimes with yellowish or olive tinges. The surface is dry and can be slightly velvety when young, becoming smoother with age. It bruises blue when handled.
Gills
This mushroom does not have gills. Instead, it has pores on the underside of the cap. The pores are small, round, and initially yellow, turning orange to red with maturity. They bruise blue when touched.
Stem
The stem is stout, cylindrical, and typically 5 to 12 cm long and 1 to 3 cm thick. It is usually yellow at the apex and red towards the base, often covered with a fine network of reddish or brownish reticulation. The stem also bruises blue when handled.
Flesh
The flesh is firm and yellowish, quickly turning blue when cut or bruised. This color change is a key identifying feature.
Fruiting body
The fruiting body of Neoboletus luridiformis is a fleshy mushroom with a distinct cap and stem. It typically grows to a medium to large size.
Habitat
Neoboletus luridiformis is found in deciduous and coniferous forests, forming mycorrhizal associations with trees such as oak, beech, and birch. It typically fruits from summer to autumn.

Key Facts

  • Cap surfaces: Dry, slightly velvety when young, becoming smoother with age.
  • Growth Form: Solitary or in small groups.
  • Spore Print: Olive-brown.
  • Body color: Variable, often red, orange, or brown with yellowish or olive tinges.
  • Odor: Mild and fungal.
  • Flesh bruises: Quickly turns blue when cut or bruised.
  • Height: 5-12 cm
  • Cap Diameter: 5-15 cm
  • Nutrient gathering: Mycorrhizal

Toxic

Moderate Toxicity

Neoboletus luridiformis is toxic when raw or undercooked, causing gastrointestinal distress. It must be thoroughly cooked before consumption to neutralize the toxins.

Toxin Type: Unknown thermolabile toxinsReaction Type: Gastrointestinal upset, including nausea, vomiting, and diarrhea.

Quick Check

  • Odor: Mild and fungal, not distinctive.
  • Fruiting: Summer to Autumn
  • Substrate: Soil, in mycorrhizal association with trees.

Where to Find

Europe

Common throughout Europe, particularly in deciduous and mixed forests.

North America

Occasionally found in North America, especially in regions with similar forest ecosystems.

Finding Tips

Look Near Host Trees

Search for this bolete near oak, beech, and birch trees, as it forms mycorrhizal relationships with these species.

Check in Summer and Autumn

The fruiting season is typically from summer to autumn, so these are the best times to search.

Examine Forest Edges

Check along forest edges and in areas with dappled sunlight, as these conditions are often favorable for bolete growth.

Similar Species

Bitter Beech Bolete

Mushroom

Also known as: Caloboletus calopus

Scientific Classification

Phylum
Basidiomycota
Class
Agaricomycetes
Order
Boletales
Family
Boletaceae
Genus
Neoboletus

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