Baltzo, "Lichens of Mt. Diablo State Park", 1989. Notes: Thalli on "volcanic rock," "Diablo" are dull medium brown to pale brownish cream color, the areoles corwded, their edges turning downward; hypothallus not clearly visible between the areoles. Cortex UV-; medulla thick, white, UV pae greenish, I-.
-Collection Herre, 1930.
-Collection Herre, 1930.
-Collection Herre, 1930.