Pseudocyphellaria argyracea

Pseudocyphellaria argyracea is a species of foliose lichen in the family Peltigeraceae. It was first scientifically described in 1822 by Dominique François Delise. Edvard Vainio transferred it to the genus Pseudocyphellaria in 1898.

Description
Pseudocyphellaria argyracea has a foliose thallus that ranges from rosette-forming to irregularly spreading. Its upper surface features white soralia and pseudocyphellae, while the pseudocyphellae and  margins bear simple to coralloid isidia.

Habitat and distribution
From East Africa to India, Japan, New Zealand, South America, and the Pacific islands, Pseudocyphellaria argyracea has a broad distribution in the Palaeotropics.