Locality:
United States, California, Los Angeles, San Clemente Island: Eel Point to Seal Cove, west shore of the island
Habitat:
Rocks at tops of outcrops just above sea.; Flat rocks
Occurrence Remarks:
Pruinose and epruinose forms grow together, the thalli of the epruinose form usually overlapping the pruinose form, both, however, evidently identical anatomically and chemically.