Skeletocutis nothofagi is a rare species of poroid crust fungus in the family Polyporaceae that is found in South America.

It has been proposed for inclusion in the IUCN Red List of Threatened Species due to its highly restricted distribution and rare occurrence.

[1] Skeletocutis nothofagi was described as a new species in 2001 by Argentinian mycologist Mario Rajchenberg.

The holotype collection was made in Tierra del Fuego in 1999, where the fungus was found on a fallen branch of Nothofagus betuloides.

The sterile margin is cream coloured, and has a felty texture that is more prominent if viewed with a hand lens.