Physcia sp?

Physcia sp?

Observation - Physcia sp?. Description: Not sure if this is P. caesia or P. tenella so any comments will be great, thanks. Found growing on a Sycamore. Only this small area had developed apothecia.

Not sure if this is P. caesia or P. tenella so any comments will be great, thanks. Found growing on a Sycamore. Only this small area had developed apothecia.