Rubroboletus rhodoxanthus

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Rubroboletus rhodoxanthus
Boletus rhodoxanthus.JPG
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Boletales
Family: Boletaceae
Genus: Rubroboletus
Species: Rubroboletus rhodoxanthus
Binomial name
Rubroboletus rhodoxanthus
(Krombh.) Kuan Zhao & Zhu L.Yang (2014)
  • Boletus sanguineus var. rhodoxanthus Krombh. (1836)
Rubroboletus rhodoxanthus
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Mycological characteristics
pores on hymenium
cap is convex
stipe is bare
spore print is olive-brown
ecology is mycorrhizal
edibility: poisonous

Rubroboletus rhodoxanthus is a fungus of the genus Rubroboletus, known for many years as Boletus rhodoxanthus until 2014. It is a rare, inedible bolete found in warm deciduous forests of southern Europe mainly under oak and beech, on chalky soil.


Rubroboletus rhodoxanthus produces a large, colourful fruit body. The cap is convex, coloured mostly whitish-grey, and flushed with pink especially towards the margin. The cap expands with maturity and may exceed 20 cm in diameter. The tubes are initially yellow in immature specimens, soon becoming bright red, and stain blue when damaged.

The stem is bulbous when young, but becomes more slender with maturity. It bears a dense carmine network covering an orange-yellow background. The flesh is bright yellow, turning blue when cut but only in the cap and not in the stem base. It has a mild taste.

The spores are olive-brown in colour, ellipsoid to spindle shaped, sized 10–15 by 4–5.5 μm.

Distribution and habitat[edit]

Rubroboletus rhodoxanthus is a generally rare species found in southern Europe. It is common in Cyprus under golden oak (Quercus alnifolia).[1] It is considered critically endangered in the Czech Republic.[2]


Rubroboletus rhodoxanthus is poisonous and unsuitable for consumption, although its toxicity varies significantly from region to region depending on the substrate.

Similar species[edit]

  • Boletus legaliae grows with oak, and has a distinctive smell of chicory. Its cap is initially grey and then later flushes carmine from the rim.
  • Imperator rhodopurpureus grows in mixed woodland, and also bears red-coloured pores and stem. It has a reddish cap with pink or crimson overtones, and flesh that stains deep blue throughout.
  • Rubroboletus satanas grows in a similar habitat, and shares many features with R. rhodoxanthus including a whitish cap. However, its cap lacks flushes of pink, its flesh is whitish and turns pale blue all over when the fungus is sectioned.

See also[edit]


  1. ^ Loizides M (2011). "Quercus alnifolia: The Indigenous Golden Oak of Cyprus and its Fungi". Field Mycology. 12 (3): 81–88. doi:10.1016/j.fldmyc.2011.06.004. 
  2. ^ Mikšik M. (2012). "Rare and protected species of boletes of the Czech Republic". Field Mycology. 13 (1): 8–16. doi:10.1016/j.fldmyc.2011.12.003. 
  • E. Garnweidner. Mushrooms and Toadstools of Britain and Europe. Collins. 1994.
  • M. B. Ellis, J. P. Ellis Fungi without gills (hymenomycetes and gasteromycetes): an identification handbook. Springer. 1990.