A good key and visual description of the genus Peltigera: Pelt Lichens of North America
A question mark indicates that species is not verified in the Gorge although it may be found several miles to either side.
British Felt Lichen, Flaky Freckle-pelt: Peltigera britannica ?
Felt Lichen, Tree Pelt: Peltigera collina (Synonym: Peltigera scutata) - One of the few Peltigera species to regularly grow on bare tree trunks. All other Peltigera species are found on mossy substrateson the ground or at the base of trees. It also has a distinctive powdery soredia along the wavy margins.
Felt Lichen, Ruffled Freckle-pelt: Peltigera leucophlebia (Synonyms: Peltigera aphthosa var. variolosa, Peltigera variolosa) ?
Diamond Pelt, Membranous Felt Lichen: Peltigera membranacea
Carpet Pelt, Felt Lichen, Frog Pelt Lichen: Peltigera neopolydactyla (Synonyms: Peltigera occidentalis, Peltigera polydactyla var. neopolydactyla) ?
Felt Lichen, Many-fingered Pelt: Peltigera polydactylon ?
Dark Veined Pelt Lichen, Fan Pelt, Felt Lichen: Peltigera venosa