Calogaya pusilla is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae.

It was originally formally described in 1852 by Italian lichenologist Abramo Bartolommeo Massalongo, who placed it in genus Physcia.

[2] It has undergone several changes of genus in its taxonomic history, including transfers to Caloplaca, Placodium, and Teloschistes.

[3] Calogaya pusilla is common in Europe, and has been recorded from a few locations in the United States.

Its typical habitat is on vertical, calcareous rock surfaces.