who reported it as assigned to Schismatomma hypothallinum (Zahlbr.) Hasse, but not really belonging to that genus based on his communitcation with Tehler.
Coastal sage scrub with Encelia, Ambrosia, Coreopsis, Agave, Dudleya, Galvezia. Forming extensive white sheets over rock faces on high cliffs immediately above the sea on north-facing windward rocks.
Voucher from 300 g sample submitted to the National Caner Institute (as Schismatomma hypothallinum) for antitumor/anti- HIV screening. Duplicate material submitted January 1999 to the Lichen Exchange under the Director of Thomas Nash III at Arizona State University. World Botanical Associates, Laurel MD 20709-0829.