Green crusty lichen?

Green crusty lichen?

Observation - Green crusty lichen?. Description: I am trying to find out if the green crusty looking material is a lichen and if so, could anyone be kind enough to ID it - many thanks. This was found growing on a Sycamore.

I am trying to find out if the green crusty looking material is a lichen and if so, could anyone be kind enough to ID it - many thanks. This was found growing on a Sycamore.