What kind of lichen is it?
I'm pretty sure that it is a cup lichen from the genus Cladonia. A probable species is Cladonia pyxidata, which is relatively common across Europe. My lichen knowlegde is rusty though, and Cladonia is rather species rich with several species that are relatively similar.


(C. pyxidata, pic from http://fungi.myspecies.info/taxonomy/term/4557/media)