Bulbothrix thomasiana is a species of foliose lichen in the family Parmeliaceae.

It is a corticolous species that grows on tree trunks in the northern and central parts of South America.

The lichen was formally described as a new species in 2011 by lichenologists Michel Benatti and Marcelo Marcelli.

The specific epithet honours American lichenologist Thomas Hawkes Nash III.

This Parmeliaceae-related article is a stub.