Ricasolia amplissima
![Ricasolia amplissima](https://amazon.clikpic.com/lichen/images/R._amplissima_resized.jpg)
This lichen grows near the edge of woodland on horizontal branches where there is dappled shade. I have found it on both hazel and oak but it is quite rare and difficult to spot/ Identification is easy because of the distinctive brown bush like structures called cephalodia