Pseudocyphellaria glabra is a species of corticolous (bark-dwelling), foliose lichen in the family Peltigeraceae.

Pseudocyphellaria glabra has a disjunct distribution that is separated by the Tasman Sea and the Pacific Ocean.

Population genomic analyses suggest that lichens from these different locations are genetically distinct, but regular long-distance dispersal of spores during the Quaternary probably prevented the local populations from evolving into distinct species.

[2] The lichen was first formally described in 1844 by Joseph Dalton Hooker and Thomas Taylor as a member of the genus Sticta.

The fungus, first recorded from specimens collected in New Zealand, causes patches that are bordered by a necrotic zone measuring 1.5–8.5 mm (0.06–0.33 in) in diameter, and usually located on the margins of the host thallus.