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Beautiful photo by Chas Penny. Yellow scales, also called Shore Lichen, (Xanthoria parietina), are a lichen species characterized by lobed margins and a wrinkled centre. It is usually found where the air is filled with mineral salts, especially near the sea and on rocks and walls.

Without the health risks of air pollution, fresh air feels great for our lungs. Lichens love clean air too - in fact, their sensitivity to air pollution means they make great air quality indicators. Like small signposts, these curious organisms can tell us a lot about the air we are breathing --- Dunbar's air is exceptionally clean.

 

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