HABITAT grove on top of hill overlooking sea; SUBSTRATE sheltered limb of Rhus on cliff top; ASPECT shaded; NOTES K~y C- KC- UV- 350nm, white crust, apothecia scattered abundant white pruinose flat disks, rims white and lecanorine with algae, epihymenium dark brown clearing in K remaining POL+, hypothecium red-brown turning olive-brown in K; SPORES hyaline, smooth, curved, broader in middle, tips rounded, nearly all 3-septate, 15-18 x 3-4 m.