This determination is Part 2 of "https://www.inaturalist.org/observations/141154285". I'm only too happy to follow the suggestion (see comments in the other observation) of Julie Hilligsøe Lisby and the recommendation of the British Lichen Society (https://britishlichensociety.org.uk/sites/www.britishlichensociety.org.uk/files/Hypotrachyna %20revoluta_0.pdf).
I therefore suggest "Hypotrachyna revoluta" because the designation with the "s" = "Hypotrachyna revoluta s" is not stored here in the system.
In addition, only 60 H. revoluta and 55 H. afrorevoluta have been verified here in iNaturalist in Europe, of which in Germany, only 1 observation!
I'll try in a few days to take some more detailed pictures...