Phacopsis vulpina is a species of lichenicolous (lichen-dwelling) fungus in the family Parmeliaceae, and the type species of the genus Phacopsis.

It was formally described as a new species in 1852 by French mycologist Edmond Tulasne.

[2] The fungus is restricted to the genus Letharia as a host and consequently has a Northern Hemisphere distribution.

Externally, it is somewhat similar in appearance to P. lethariellae, but P. vulpina does not have a brown hypothecium (the area of tissue in the apothecium immediately below the subhymenium).

This Parmeliaceae-related article is a stub.