in Lea, Cat. Pl. Cinc.: 47 (1849).

Basionym: Collema corticola Taylor, Lond. J. Bot. 5: 195 (1847).

Protolog: Data lacking.

Type locality: USA, Ohio, Lea (BM, FH - isotypes).

Type locality coordinates: Data lacking.

Barcode: Data lacking.

Thallus: foliose, thick, strongly wrinkled, often developing pustules that tend to elongate as the thallus grows, forming a regular radiating pattern. Thallus surface shiny, frequently with a greenish, nearly torquoise, cast, often also slightly brownish (Jørgensen & James 1983).

Photobiont: Data lacking.

Chemistry: No lichen substances.

Ecology: Data lacking.

Note: Jørgensen & James (1983: 117): "The status of this as a distinct taxon has been much in doubt, particularly in Europe (Du Rietz 1922: 321). However, as pointed out by Sierk (1964: 303), Leptogium corticola is a well delimited species. some of the past confusion is due to extreme, unusually strongly striate morphs of L. cochleatum. Leptogium corticola is a much thicker, strongly and densely wrinkled species, often developing pustules that tend to elongate as the thallus grows, forming a regular radiating pattern. Leptogium corticola normally has a shinier thallus surface than L. cochleatum, frequently with a greenish, nearly torquoise, cast, often also slightly brownish."