DR J. BLOEMEN / SCIENCE PHOTO LIBRARY DR J. BLOEMEN / SCIENCE PHOTO LIBRARY
Crustose lichens on the bark of a sycamore tree (Acer pseduoplatanus). The colony in the centre of the picture is Lecanora chlarotera and both below and above it are smaller colonies of Lecidella elaeochroma. Photographed in Cumbria in the UK.
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