If this is Parmotrema, I think the pillow-shaped soralia and lack of marginal cilia lead to this species.
A recipe for disaster, given that the bolete is poisonous, and Tremella is probably just gross. Mykoweb suggests you can tell species of Tremella apart by their host fungus. I had kind of thought the stuff in the background was a lichen, but maybe it's old Stereum? Are there species of Peniophora that grow in lobes like that? This chunk was 6-7 cm wide, so these weren't tiny.
I was drawn to the large, green apothecia on this one, but so far I haven't found any good matches. Xanthoparmelia looks similar, but grows on rocks (this was on an oak tree). Flavoparmelia also seems like an option, but apparently it rarely forms apothecia. Frankly I'm not even 100% sure the foliose lichen with all the isidia (sorredia?) is the one producing the apothecia. If it is, the lower surface didn't seem to have cilia or rhizines and did not look particularly tomentose.
This one I could believe was Flavoparmelia caperata.
It deserves a better name than "lace lichen" or Ramalina menziesii. I'm not sure I've actually seen this growing in the East Bay before. Maybe I just need to pay closer attention.
I was trying to convince myself this was something other than A. menziesii. The leaves and the hairs were large.
Zeller's or something like it. A bit old, but the pores seemed to have a blue blush. Stem seemed to stain red, but I'm not sure that makes any sense.
A. constricta is also a possibility, I guess, but the volva didn't seem noticeably constricted. Next time I need to get a better pic of it.
On California figwort (Scrophularia californica).
One of several large, worm-eaten boleros. Maybe appendiculatus, but no stain... I don't really think they were in an identifiable state (not by me, anyway).
Lots and lots of it here.