Boletus chrysenteron Bull., 1791
Common names: Red Cracking Bolete [En], Bolet à chair jaune, Bolet chrysenteron [Fr], Roodsteelfluweelboleet [Nl], Rotfuß-Röhrling [De], Boleto de de carne amarilla [Es]
Meise, BRABANT ● Belgium
Taxonomy: This mushroom was first described and named as Boletus communis in 1789 by the eminent French botanist Jean Baptiste Francois Pierre Bulliard. Two years later in 1791 it was given the specific epithet chrysenteron by the same author. Almost one hundred years later in 1888 Lucien Quelet placed it in the new Xerocomus genus, and retained the chrysenteron epithet. This binomial was generally accepted for almost another hundred years, until 1985 when Marcel Bon decided to resurrect the former specific epithet communis, which resulted in the binomial Xerocomus communis. It now resides back in the Boletus genus, and sports its 1791 binomial, and authority once again, and is currently known as Boletus chrysenteron Bull.
Description: Young specimens of B. chrysenteron often have a dark, dry surface, and tomentose caps which might easily be mistaken for Bay Boletes B. badius. When fully expanded, caps are 4 to 10 cm in diameter with very little substance and thin flesh that turns a blue color when slightly cut or bruised. Caps mature to convex and plane in old age. Cracks in the mature cap reveal a thin layer of red flesh below the skin. The 10 to 15 mm diameter stems have no ring, are bright yellow and the lower part is covered in coral-red fibrils and has a constant elliptical to fusiform diameter throughout its length of 4 to 8 cm tall. The cream-colored stem flesh turns blue when cut. B. chrysenteron has large, yellow, angular pores, and produces an olive brown spore print.
Biology : It grows solitary or in small groups from early fall to mid-winter. It is frequent in parts of the northern temperate zones.
Habitat: hardwood/conifer woods. It is mycorrhizal with hardwood trees, often beech on well drained soils.
Distribution: Europe, Amérique du Nord.
Wikipedia, Boletus chrysenteron