Lichen Flora Greater Sonoran Desert Region 1: 185 (2002).

Protolog: Endocarpon pusillum simile, sed differt rhizinis rhizohyphisque nullis. Type: Mexico, Baja Califronia Sur: N-facing conglomerate outcrops along pass through the Sierra de la Giganta 23,5 km SW of Loreto along dirt road to San Javier, 25°57'N, 111°30'W, c. 580 m, 18 March, 1992, T. H. Nash III 30410 (ASU).

Type locality: Mexico, Baja Califronia Sur, N-facing conglomerate outcrops along pass through the Sierra de la Giganta 23,5 km SW of Loreto along dirt road to San Javier, c. 580 m, 18.3.1992, T. H. Nash III 30410 (ASU - holotype).

Barcode: Data lacking.
Coordinates: 25°57'N, 111°30'W.