Stock Photo - PRODUCTION - 16 March 2022, Rhineland-Palatinate, Börfink: A dead beech stands in the Springenkopf natural forest reserve in the Hunsrück-Hochwald National Park. Rare pinhead lichens grow on the dead wood of the tree. More than 150 different lichen species have been counted in the national park, some of which are considered indicators of particularly high air quality. (to dpa: ""Lichens in Hunsrück show where the air is still clean"") Photo: Peter Zschunke/dpa-Zentralbild/dpa. - Börfink/Rhineland-Palatinate/Germany

Stock Photo: PRODUCTION - 16 March 2022, Rhineland-Palatinate, Börfink: A dead beech stands in the Springenkopf natural forest reserve in the Hunsrück-Hochwald National Park.

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