Tylopilus felleus, commonly known as the bitter bolete or the bitter tylopilus, is a bolete that has slightly to distinctly pink pores on the underside of the bun-shaped brown cap and a dark net on the thick stem are characteristic of this bolete. It is also distinguished by a very bitter taste.
Grey-yellow to pale- or walnut-brown, it is slightly downy at first and later becomes smooth with a matte lustre. It is initially convex before flattening out with maturity. Flesh whitish, with pinkish tinge beneath cap cuticle, unchanging, thick and firm. Stem
pallid background with brown reticulation, stout and slightly bulbous. The mushroom has no ring.
When young this is easily mistaken for Boletus edulis, except that it is very bitter and has a dark stem net.
on the www.first-nature.com web site.
on the MushroomExpert.Com Web site.