Bryologist 93, 3: 341 (1990).
Synonym: Index Fungorum
Protolog: Thallus fruticosus, unifolius, laete-viridis, lobis flabelliformis, usque ad 12 cm latis, planis, in longitudinem rugulosis, superficiebus similibus, pseudocyphellatis, pseudocyphellis sparsis, medulla visibili. Apothecia multa, terminalia, laminis, et marginalia; disco pruinoso, usque ad 12 mm diametro; sporis octenis, 1-septatae, curvi, 12-18 x 5-6 µm. Acidum usnicum continens. TYPE: MINNESOTA. CLEARWATER CO.: Lake Itasca Biological Station grounds, 23 June 1981, Thomson 21360 (WIS, isotypes in DUKE, MIN, US).
Photobiont: Data lacking.
Chemistry: K-, C-, P-, KC+ yellow, usnic acid in TLC (checked by Chicita F. Culberson) (Thomson 1990: 341).
Ecology: On bark of twigs and branches of deciduous trees, including Fraxinus pensylvanica var. lanceolata, Quercus macrocarpa, Ulmus americana, and less commonly on Betula papyrifera.
Molecular data: Genbank
Distribution: USA. Database
Note:
Type locality: USA, Minnesota, Clearwater County, Lake Itasca Biological Station grounds, xxx m, 23 June 1981, Thomson 21360 (WIS - holotype; DUKE, MIN, US isotypes).
Barcode: Data lacking.
Coordinates: Data lacking.