Butyriboletus roseogriseus

About

Butyriboletus roseogriseus is a pored mushroom in the family Boletaceae found in Europe, originally described as a species of Boletus in 2014 before being transferred to the newly created genus Butyriboletus later that same year. The fungus produces large caps 70–120 mm in diameter that start light pink or greyish-pink when young before shifting to grey, ochraceous or brown, with bright yellow tubes and pores that bruise greenish-blue on contact, and a stout yellow stipe featuring a distinctive net-like pattern. It is known only from a few localities in the Maple Mountains of eastern Moravia, Czech Republic, where it forms beneficial relationships primarily with silver fir in submontane forests at 575–610 metres above sea level.

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