Neoboletus luridiformis

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Neoboletus luridiformis
Boletus erythropus 2010 G3.jpg
N. luridiformis, Germany
Scientific classification
N. luridiformis
Binomial name
Neoboletus luridiformis
(Rostk.) Gelardi, Simonini & Vizzini (2014)
  • Boletus luridiformis Rostk. (1844)
  • Suillus luridiformis (Rostk.) Kuntze (1898)
  • Boletus erythropus Pers. (1796)
Neoboletus luridiformis
View the Mycomorphbox template that generates the following list
Mycological characteristics
pores on hymenium
cap is convex
hymenium is adnate
stipe is bare
spore print is olive-brown
ecology is mycorrhizal
edibility: choice but not recommended

Neoboletus luridiformis, known until 2014 as Boletus luridiformis, is a fungus of the bolete family, all of which produce mushrooms with tubes and pores beneath their caps. It is found in Northern Europe and North America, and is commonly known as the dotted stem bolete. Although edible when cooked, it can cause gastric upset when raw and can be confused where the two species coincide with the poisonous Rubroboletus satanas, which has a paler cap.


Boletus luridiformis was originally described by Christian Hendrik Persoon in 1796 as Boletus erythropus – a name since reduced to synonymy[1] – which derived its specific name from the Greek ερυθρος ("red") and πους ("foot"),[2] referring to its red coloured stalk. Its French name, bolet à pied rouge or 'red-foot bolete' is a literal translation.

Genetic analysis published in 2013 showed that B. luridiformis and many (but not all) red-pored boletes were part of a dupainii clade (named for Boletus dupainii), well-removed from the core group of Boletus edulis and relatives within the Boletineae. This indicated that it needed to be placed in a new genus.[3] It became the type species of the new genus Neoboletus in 2014.[4]


N. luridiformis, found in Ukraine. After cutting, the yellow interior quickly turns blue due to oxidation.

Neoboletus luridiformis is a large solid fungus with a bay-brown hemispherical to convex cap that can grow up to 20 cm (8 in) wide, and is quite felty initially. It has small orange-red pores that become rusty with age, and bruise blue to black. The tubes are yellowish-green, and become blue quickly on cutting. The fat, colourful, densely red-dotted yellow stem is 4–12 cm (2–5 in) high, and has no network pattern (reticulation). The flesh stains dark blue when bruised; broken, or cut.[1] There is little smell. The spore dust is olive greenish-brown.

The similar Suillellus luridus has a network pattern on the stem, and seems to prefer chalky soil.Also, Rubroboletus satanas also has a stem network, but a very-pale whitish cap. Rubroboletus pulcherrimus has a reticulate stipe, and is larger in size. [5]

Distribution and habitat[edit]

The fungus grows in deciduous or coniferous woodland, in summer and autumn, in Europe. It is often found in the same places as Boletus edulis. It is also widely distributed in North America, and is especially common under spruce in its range from Northern California to Alaska. In Eastern North America it grows with both soft, and hardwood trees.[6] It seems to prefer acid soils.


Mild tasting, Neoboletus luridiformis is edible after cooking, though caution is advised as it resembles other less edible blue-staining boletes, and should thus be avoided by novice mushroom hunters.[6][page needed]

In the United Kingdom, Boletus erythropus was considered edible, but the blue color was seen as off-putting.


  1. ^ a b Roger Phillips (2006). Mushrooms. Pan MacMillan. ISBN 978-0-330-44237-4.
  2. ^ Liddell, Henry George & Robert Scott (1980). A Greek-English Lexicon (Abridged Edition). United Kingdom: Oxford University Press. ISBN 978-0-19-910207-5.
  3. ^ Nuhn ME, Binder M, Taylor AF, Halling RE, Hibbett DS (2013). "Phylogenetic overview of the Boletineae". Fungal Biology. 117 (7–8): 479–511. doi:10.1016/j.funbio.2013.04.008. PMID 23931115.
  4. ^ Gelardi M, Simonini G, Vizzini A (October 17, 2014). "Nomenclatural novelties" (PDF). Index Fungorum (192).
  5. ^ Desjarind D.E, Wood M.G, Stevens F.A. (2015). California Mushrooms. The comprensive identification guide. Portland, Oregon: Timber Press. p. 354. ISBN 978-1-60469-353-9.CS1 maint: Multiple names: authors list (link)
  6. ^ a b David Arora (1986). Mushrooms Demystified. Ten Speed Press. ISBN 978-0-89815-169-5.
  • Phillips R (1985). Mushrooms and other fungi of Great Britain and Europe. pan Books. ISBN 978-0-330-26441-9.
  • Zeitlmayr L (1976). Wild Mushrooms:An Illustrated Handbook. garden City Press, Hertfordshire. ISBN 978-0-584-10324-3.