''Tylopilus rubrobrunneus'', commonly known as the reddish brown bitter bolete, is a bolete fungus in the family

Boletaceae The Boletaceae are a Family (biology), family of mushroom-forming fungi, primarily characterised by small pores on the spore-bearing hymenium, hymenial surface (at the underside of the mushroom), instead of Lamella (mycology), gills as are found ...

. It was first described scientifically in 1967 by Samuel J. Mazzer and Alexander H. Smith from collections made in

Michigan Michigan ( ) is a peninsular U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest, Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, ...

. The bolete was reported from a Mexican beech (''Fagus mexicana'') forest in Hidalgo, Mexico in 2010. The cap is wide. The stem is 7–13 cm tall and 1.5–3 cm thick. The flesh is white and can bruise yellowish, with a very bitter taste. The spore print is pinkish brown. It can be found under

beech Beech (genus ''Fagus'') is a genus of deciduous trees in the family Fagaceae, native to subtropical (accessory forest element) and temperate (as dominant element of Mesophyte, mesophytic forests) Eurasia and North America. There are 14 accepted ...

and

oak An oak is a hardwood tree or shrub in the genus ''Quercus'' of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisp ...

trees in eastern North America from July to September. The species is inedible.

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* rubrobrunneus Fungi described in 1967 Fungi of Mexico Fungi of the United States Fungi without expected TNC conservation status Fungus species {{Boletales-stub

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