What is "tylopilus"

Tylopilus is a genus of over 100 species of mycorrhizal bolete fungi separated from Boletus. Its best known member is the bitter bolete ( Tylopilus felleus), the only species found in Europe. More species are found in North America, such as the edible species T. alboater, and the tropics. Australia is another continent where many species are found. All members of the genus form mycorrhizal relationships with trees. Members of the genus are distinguished by their pinkish pore surfaces.