Not much doubt about this one

Not much doubt about this one

Observation - Not much doubt about this one - UK and Ireland. Description: Forked thalline liverwort on a tree trunk, mostly green but this patch Prussian blue. Sorry about th

Forked thalline liverwort on a tree trunk, mostly green but this patch Prussian blue.
Sorry about the photo quality, it was in deep shade and starting to rain.