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I think the black spots are where the soredia develop, which you can see side-by-side with the developed soredia in photo 3.
Growing on a wooden dock in the harbor near to Parmelia, Ramalina, and I'm not 100% sure on the yellow lichen.
The primary photobiont (photosynthesizing partner) of this lichen is Trebouxia, a green alga. The primary fungal partner is what the lichen takes its name after. A lichen is a composite organism consisting of one or more photobionts and one or more fungal species.
Lat: 57.78, Long: -152.41
Spotted on Mar 30, 2019
Submitted on Jul 8, 2019