Author: Jan Scholten
Synonyme: Boletus erythropus; Boletus luridiformis.
Name: the Greek erythropos means "red" and "foot".
English: Scarletina bolete;: Dotted stem bolete.
German: Flockenstielige Hexen-Röhrling; Schusterpilz; Tannenpilz; Donnerpilz; Zigeunerpilz.
French: Bolet à pied rouge.
Region: Northern Europe, North America.
Habitat: deciduous or coniferous woodland, prefers acid soils.
Use: edible, when cooked properly, gastric upset when eaten raw.
Neoboletus luridiformis is a large solid fungus with a bay-brown hemispherical to convex cap that can grow up to 20 cm 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 ± 10 cm high, and has no network pattern. The flesh stains dark blue when bruised, broken, or cut. There is little smell. The spore dust is olive greenish-brown. The pores are red, yellow when young.
Genetic analysis Boletus luridiformis and many red-pored boletes were part of a dupainii clade, well-removed from the core group of Boletus edulis. This indicated that it needed to be placed in a new genus, Neoboletus, in 2014.