[1] It is monotypic, containing the single species Galbinothrix caesiopruinosa,[2] a corticolous (bark-dwelling) lichen.

Both the genus and species were described as new to science in 2018 by Andreas Frisch, Göran Thor, Kwang Hee Moon, and Yoshihito Ohmura.

The type specimen was collected in Chichibu Tama Kai National Park (Nagano Prefecture) at an elevation of 1,414 m (4,639 ft), where it was found growing on the smooth bark on an Alnus tree in a montane forest along the Shinano River.

[3] Galbinothrix caesiopruinosa occurs in Japan, including Hokkaido and central Honshu, and in the eastern mountain range of South Korea.

Common and widespread in this region, it has been collected from shady and humid forests, as well as from planted trees along roadsides and in parking lots.