Large growth on bark, Pimlico - 2017

Large growth on bark, Pimlico - 2017

Observation - Large growth on bark, Pimlico - 2017 - UK and Ireland. Description: Difficult to photograph - high above my head. There were two specimens on two adjoining trees. I did

Difficult to photograph - high above my head.
There were two specimens on two adjoining trees. I didn't photograph the second, which seemed to have a smaller one growing on the upper edge.
NB - neither a garden nor a park - just the side of a city street.