These are some of the crustose lichens I was very excited to see at this park, in more urban areas, even the suburbs, there’s far less variety of lichens since they are so sensitive to air pollution. If you look at Urban Lichens A Field Guide For Northeastern North America it doesn't claim to be exhaustive but the key in there is maybe 1% the size of the key for North American lichens.
Anyway here’s three of the ones that made me gasp and say “ooooooooo!” Out loud.