Picture taken on the 10th May 2008 at Parc de la Pedra Tosca, Les Preses, Garrotxa, Catalonia on lava, being a very frequent lichen there. It surprises me, because it normally grows on twigs, although Mr. Mike Sutcliffe has found it on plastic pipes.
Anybody else has found it on lava?
Nikon Coolpix 4,500, umbrella.
Autoeye, PH and HTLM Editor.
See:
F. Dobson, Lichens
M. Sutcliffe, UK Lichens
Nimis & Martellos, Italic