The oak woods of Newton skirting the foot of Roseberry are beginning to wake up from its winter hibernation. This lichen has probably been there all winter but I must admit that only in the spring sunshine have I noticed it. They say that lichens are a sign of clean air which is a good sign close to industrial Teesside. Lichens are notoriously difficult to identify. I think this is Oakmoss or Evernia prunastri by its scientific name. It is still used in the French perfume industry as a fixative where it is known as Mousse de Chêne.