Lichen Rings, Greenwich Park - 2013

Lichen Rings, Greenwich Park - 2013

Observation - Lichen Rings, Greenwich Park - 2013 - UK and Ireland. Description: Growing on a sheltered wall. I'm not sure if these are lichens - lots of moss and very moist patches. But I keep thinking I've seen something like this before. ADDED a third picture - cobwebby or just out of focus? Thanks to AlanS.

Growing on a sheltered wall. I'm not sure if these are lichens - lots of moss and very moist patches. But I keep thinking I've seen something like this before.
ADDED a third picture - "cobwebby" or just out of focus? Thanks to AlanS.