Caloboletus rubripes

Caloboletus rubripes, commonly known as the red-stemmed bitter bolete or the red-stipe bolete, is a species of fungus in the family Boletaceae. It was known as Boletus rubripes until 2014. The fruit bodies (mushrooms) are robust, with caps up to 18 cm (7 in) in diameter, atop thick stipes 5–12 cm (2–4+3⁄4 in) long. The flesh has a very strong bluing reaction when cut or damaged. It can be differentiated from similar boletes by its cap color and non-reticulate stipe. It forms mycorrhizal relationships, primarily with conifers. The mushrooms are non-toxic, but are so bitter as to be inedible....read more on Wikipedia.