Stock Photo - The lichens expert, biologist Oliver Duerhammer presents a Silicate rock with the lichen Rhizocarpon geographicum and Parmelia omphalodes in Pentling, Germany, 19 January 2018. Lichens are important bioindicators of air pollution and climate change. Photo: Armin Weigel/dpa. - Pentling/Bavaria/Germany

Stock Photo: The lichens expert, biologist Oliver Duerhammer presents a Silicate rock with the lichen Rhizocarpon geographicum and Parmelia omphalodes in Pentling, Germany.

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