Pseudocyphellaria perpetua is a species of corticolous (bark-dwelling), foliose (leafy) cyanolichen in the family Peltigeraceae.

[1] It is distinguished from similar species, including some forms of P. crocata, by its yellow medulla and mostly marginal soralia.

Other characteristics include its narrow, linear lobes, and its pale lower undersurface.

[2] P. perpetua occurs on both conifer and hardwood trees in oceanic areas of the western North America and in the Russian Far East.

[1] It has also been documented as an uncommon species in Nova Scotia (eastern Canada).