The Fylingdales Stone 1
Image by fitzcoraldo

My father-in-law is a mossologist (or whatever they're really called), not into lichen though*.

*So, this comment is totally irrelevant :-) But I've been dying to subvert this thread ...

Moss is cool too, always good for a bit of peel-and-reveal.
Not as good as Lichen though, not enough algae. It's a top symbiote is lichen.

>But I've been dying to subvert this thread...
Consider it slightly subverted :)