Fuscidea appalachensis is a species of saxicolous (rock-dwelling) in the family Fuscideaceae.

Found in North America, it was formally described as a new species in 2008 by lichenologist Alan Fryday.

The type specimen was collected from top of Tabor Gully in Baxter State Park (Maine) at an elevation of 1,415 m (4,642 ft).

Here it was found growing on damp rocks on the side of the gully.

The lichen contains divaricatic acid, a secondary compound that can be detected using thin-layer chromatography.