Martin (1940) Phaeotremella mycophaga is a species of fungus in the family Phaeotremellaceae.

It produces small, pustular, gelatinous basidiocarps (fruit bodies) on the hymenium of the corticioid fungi Aleurodiscus amorphus and A. grantii on conifers.

[1] Phaeotremella simplex occurs on the same hosts and is indistinguishable in the field, but lacks clamp connections.

[2] Phaeotremella mycophaga parasitizes the corticioid fungi Aleurodiscus amorphus and A. grantii, both of which occur on dead attached wood of conifers.

The species was originally described from Canada,[1] but has been found elsewhere in North America[2] and in continental Europe.