Boletus nobilissimus

Boletus nobilissimus is an edible basidiomycete mushroom, of the genus Boletus in the family Boletaceae. Long considered a variety of European Boletus edulis, it has become a species on its own in 2000, with 2010 molecular study finding that it is most closely related to B. atkinsonii, B. quercophilus of Costa Rica and then B. barrowsii of western United States.^[2] It is found in abundance in open oak forests after heavy rains and warm weather (30 °C or more).

Boletus nobilissimus
Scientific classification
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Boletales
Family:	Boletaceae
Genus:	Boletus
Species:	B. nobilissimus
Binomial name
Boletus nobilissimus Both & R.Riedel, 2000[1]

Boletus nobilissimus Mycological characteristics
	Pores on hymenium
	Cap is convex
	Hymenium is adnate
	Stipe is bare
	Spore print is brown
	Ecology is mycorrhizal
	Edibility is edible

Morphology

Cap

The cap is 9.5 to 15 cm in diameter, initially convex in shape, before becoming broadly convex to plane as it ages; The surface is dry with small hair, yellow brown to vinaceous brown, and then dark brown. The thick flesh is white and does not turn blue when bruised.

Pores

The pores are white when young, becoming yellowish or brownish yellow to greenish olivaceous, unchanged when bruised.

Stipe

From 8 to 12 cm long; 1–3 cm thick, dry, solid; whitish or brownish; club shaped to bulbous with strongly raised reticulation.

Spore print

The spore print is yellowish-brown.

Spores Ellipsoid to subfusiform, smooth, pale yellow, 11.5–13.5 x 4–5 μm.^[3][4]

Habitat and distribution

Forms mycorrhiza with hardwoods, especially oak and beech in presence of pines; single, scattered, or gregarious, in summer and fall; collected in New England, New York,^[3] and other Eastern parts of United States,^[5] with distribution limits unknown.