Cool dark brown one.
Growing on the trunk of a small Western Hemlock, in Hemlock dominated forest. Scattered all over the ground in the surrounding area.
on mountain beech trunk. seems more sorediate than isidiate, but must be this one!
I'd heard there were cool lichens up on San Bruno, so I was pleasantly unsurprised to find a new-to-me lichen up there. This definitely doesn't have the hairy lobe tips of L. hallii, so I feel pretty good about the ID. There is one record of this species from Marin, but it seems like it might be unusual around the Bay.