Muurschotelkorst

On a gravestone in Korbach. I wish I'd first taken a picture of the uninteresting little green patch this seemed to the naked eye, just under 2cm in diameter. Under scrutiny using my little Leica C-LUX 1 camera in macro setting with a 9x magnifying glass, the patch instantly grew into an intricate city of green irregular leaves and cups. Moreover, the group of tiny black specks turned out to be an army of insects who'd taken residence there in a frenzy, burying their heads in the lichen skin.

Laurens Sparrius recognized it to be Lecanora muralis, in Dutch Muurschotelkorst, a very common lichen.

I'll also post pictures of the camera and magnifying glass used here.

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