Reddish Brown Bitter Bolete - Tylopilus rubrobrunneus

''Tylopilus rubrobrunneus'', commonly known as the reddish brown bitter bolete,
is a bolete fungus in the family Boletaceae. It was first described scientifically in 1967 by Samuel J. Mazzer and Alexander H. Smith from collections made in Michigan. It is found in the United States; the bolete was reported from a Mexican beech forest in Hidalgo, Mexico in 2010.