Thanks Bruce. The apothecia seem consistant with C. pyracea.
Regarding unusual substrates, they always intrigue me, but probably my time would be better spent on all the common lichens to be learned.
Lecanora pacifica also seems consistant with my specimen, although my spores are too small, averaging about 8x5µm. (Nice to have your "crust tour" photos to compare.)
I'm partially colorblind and would have called the discs caucasian flesh color, but the ones just uploaded do look murky greenish to me.