Pseudocyphellaria hirsuta

Species of lichen-forming fungus

Pseudocyphellaria hirsuta is a species of foliose lichen in the family Peltigeraceae. First described in 1835, it has undergone several taxonomic revisions over nearly two centuries. The lichen forms a flat, leaf-like structure (thallus) that can grow up to 27 cm in diameter, typically appearing grey or brown and covered in fine hairs. It is characterised by small pore-like structures called pseudocyphellae on its lower surface, which can be yellow or, less commonly, white. P. hirsuta grows mainly on trees in forested areas, particularly those dominated by southern beech (Nothofagus) species, but can also be found on rocks, soil, and stumps. The species is widely distributed in Argentina and Chile, from central regions to Tierra del Fuego, and has been observed in various forest types and elevations.

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