English: A lichen - Ramalina fastigiata This species was growing on a tree beside a footpath near Carman Reservoir.
Different lichen species vary greatly in their ability to tolerate air pollution (sulphur dioxide, in particular); this ability is quantified using the Hawksworth and Rose Zone scale, which runs from 0 ('most polluted') to 10 ('pure').
Ramalina fastigiata is assigned to zone 9, meaning that it is very sensitive to pollution; its presence here therefore indicates that air pollution levels in this part of the country are very low.
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== {{int:filedesc}} == {{Information |description={{en|1=A lichen - Ramalina fastigiata This species was growing on a tree beside a footpath near Carman Reservoir. Different lichen species vary greatly in their ability to tolerate air pollution (sulphu
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