Stock Photo - PRODUCTION - 16 March 2022, Rhineland-Palatinate, Börfink: Rare pinhead lichens (Chaenotheca trichialis) grow in a horizontal position on the vertical trunk of a dead beech tree in the Springenkopf Natural Forest Reserve of the Hunsrück-Hochwald National Park. 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

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