Tyromyces galactinus is a species of poroid fungus in the family Polyporaceae.

Found in North America, is a plant pathogen that causes a white rot in broad-leaved trees.

The type was collected near Waynesville, Ohio, where it was found growing on rotting trunks.

[2] Although originally placed in genus Tyromyces by Russian mycologist Appollinaris Semenovich Bondartsev in 1953,[3] the name is invalid as it did not confirm to the rules for naming species.

Josiah Lincoln Lowe transferred the fungus to Tyromyces validly in 1975.