Kicked off the Lichen list after noticing Elders crawling with them in the car park and embankment area. This yellow Lichen is especially noted for being on Elders apparently. The Elders seem to be hosts also to a greenish lichen (2? one leafy, one scaly?) and a moss, which I'll leave for later.
I should have a look to see if it has this parasitic fungus also - a fungus on a lichen on a tree. This bit seems quite healthy, though.