Stock Photo - The green algea grows on a rust-coloured tree bark in a garden in Sieversdorf, Germany, 30 March 2015. For ten years the trees in the local region are displaying this phenomenon which has been on the increase. The algea contains a brown colourant which stains the surface of the bark. Photo: Patrick Pleul/dpa | usage worldwide. - Sieversdorf/Brandenburg/Germany

Stock Photo: The green algea grows on a rust-coloured tree bark in a garden in Sieversdorf, Germany, 30 March 2015. For ten years the trees in the local region are.

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