U.S. Explor. Expedit. Wilkes 17: 129 (1861).

Basionym: Physcia attenuata Pers., Ann. Wetter. Gesellsch. Ges. Naturk. 2: 18 (1811) [1810].

Thallus: caespitose (max. alt. 4 cm.), rigid, virescent; cortex striate; laciniae branched, dichotomous, terete, apices filiform. Apothecia common, small (max. diam. 2.5 mm.), lateral, convex, marginate, disk buff. Spores subfusiform, straight, 18 - 21 x 6 - 7.5 µm.

Ecology: On trees and shrubs.

Note: Also as Ramalina attenuata (Pers.) Howe by Pluntke (1984: 136)