Contributions United States National Herbarium 34, 7: 530 (1968).

Basionym: Lichen glaucus, Sp. Pl.: 1148 (1753).

Type locality: Europe, Linnean Herbarium Sheet 1273-139 (LINN - lectotype).

Thallus: Data lacking.

Chemistry: Atranorin, caperatic acid (Culberson & Culberson 1968: 530).

Ecology: On bark.