Fauna looks to have been spot on with the
Cladonia.
C. rangiformis has blotchy podetia caused by the algae being in clumps rather than distributed throughout the thallus. Plenty more species in this area: it looks to have been worked by the late Francis Rose judging by records on NBN.
Not sure about the other two on stones, although my first thought is
Porpidia, but I suspect there are a couple of other genera I ought to consider.
posch