Lichen Flora Greater Sonoran Desert Region 1: 148 (2002).

Type locality: USA, California, Santa Barbara County, Santa Rosa Island, Twin Faults Area 0.5 km W of Lobos Canyon, 140 m, 1994, J. Marsh 6850 (ASU - holotype; H - isotype).

Chemistry: Atranorin, fumarprotocetraric acid, traces of protocetraric acid, traces of confumarprotocetraric acids (Ahti & Hammer 2002: 148).