Spain, Canary Islands, Tenerife Island, Taganana, prope (near) El Bailadero.
rocks (Ad scopulos)
"Usnic and Selazinic acid by TLC," C.F. Culberson in litt.
Also on label is the following item: - - Annot.: 'The specimen issued as No. 662 in Lich. Sel. exsicc. is not R. subdecipiens but rather a new species that containe 4-0-demetrylbarbatic acid. R subdecipiens contains salazinic acid as the medullary constituent." W. L. Culberson in litt.