Eyelashes on a wall

On a rocky wall along the shore of the Diemelsee lake, close to the Talsperre flood-control dam. The description that I found of Anaptychia ciliaris seemed to match, except that this Wimpermos (Eyelash moss) is supposed to be very rare, and growing on trees, on spots were they date back to the 19th century... Puzzling. But pleasantly so. And humbling. I felt as if I'm cheating through an exam, looking up stuff in books but still not sure if I got it right.

Luckily Laurens Sparrius helps out: it's Peltigera hymenina, a rare lichen, mostly to be found on the northern (West-) Friesian islands of the Netherlands, and only sporadically inland. So it's a special find.