Boletus luridiformis
| Neoboletus luridiformis | |
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| N. luridiformis, Germany | |
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Boletales |
| Family: | Boletaceae |
| Genus: | Neoboletus |
| Species: | N. luridiformis |
| Binomial name | |
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Neoboletus luridiformis (Rostk.) Gelardi, Simonini & Vizzini (2014) |
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| Synonyms | |
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| Neoboletus luridiformis | |
|---|---|
| Mycological characteristics | |
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pores on hymenium |
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cap is convex |
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hymenium is adnate |
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stipe is bare |
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spore print is olive-brown |
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ecology is mycorrhizal |
 
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edibility: choice but not recommended |
edibility: choice
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 - which derived its specific name from the Greek ερυθρος ("red") and πους ("foot"), referring to its red coloured stalk. Its French name, 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. It became the type species of the new genus Neoboletus in 2014.
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. There is little smell. The spore dust is olive greenish-brown.
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