Forum Flora Germanica

The blue stuff ? Slovenia, Karst.
http://agrozoo.net/jsp/Galery_one_image ... e7c7d6c1e5
another spot with same thing, I think:

Hi,
I don' t know exactly which things are "blue" in your opinion - the pale ones or the dark ones?
Since I have no experience with those lichens at all I can only look into the italian keys.

In my opinion this is not Caloplaca chalybaea - which seems to have a quite regular round thallus, which shows cracks. Inside the cracks you can see the blackish underlaying parts. The lichen has got a new name: Pyrenodesmia chalybaea.
https://italic.units.it/index.php?proce ... e&num=1954

If I try to use the key Nr. 27 CRUSTOSE TELOSCHISTACEAE
https://italic.units.it/flora/index.php ... ey_id=2040
I get the (possible ) result Pyrenodesmia variabilis, but I looked mainly at the lichen shown in your link.
https://italic.units.it/index.php?proce ... e&num=1957

At the bottom of your last link you have blue ones. Just never seen those with such white thalus.
Another find from same place: http://agrozoo.net/jsp/Galery_one_image ... fb8c8148cc