Evernia prunastri, commonly known as oakmoss, is a soft, pale green foliose lichen frequently found on trees and hedgerows across Milton Keynes. This distinctive species, with its flattened two‑toned lobes and powdery soralia, is an important air‑quality indicator and a valuable part of local lichen ecology. Learn how to identify Evernia prunastri, where to find it, and why this unique lichen plays such a vital role in our natural habitats.