Unknown Lichen

Unknown Lichen

Observation - Unknown Lichen. Description: Initially I thought this a Ramalina sp. but having looked closely at it, I'm not so sure and can't seem to match it to anything in my book. Hope someone can help out, thanks. Found growing on an Oak branch.

Initially I thought this a Ramalina sp. but having looked closely at it, I'm not so sure and can't seem to match it to anything in my book. Hope someone can help out, thanks. Found growing on an Oak branch.