Syn. Meth. Lich. (Lund): 307 (1814).

Type locality: North America [“Amer. Septentr.”], Mühlenburg 22-2 (H–ACH 1880 - holotype).
Chemistry: Apparently 2 chemical races:
Race I: Diffractic acid, salazinic acid, usnic acid (Huneck & Follmann 1975: 278).
Race II: Cortex containing usnic acid. Medulla K+ yellow ? orange or red; containing norstictic acid (major), salazinic acid (minor), consalazinic acid (trace) and connorstictic acid (trace) (Australien)
Ecology:

Molecular data: Genbank

Distribution: Database

Note: