Pertusaria pertusa

Pertusaria pertusa

Observation - Pertusaria pertusa - UK and Ireland. Description: I was taking a photograph of light brown apothecia on a mature Silver Birch. Looking at an enlarged photo I became more interested in the ball like structures at the bottom. I have provisionally grouped them as 'Fungi and Lichen' but I am unsure what t

I was taking a photograph of light brown apothecia on a mature Silver Birch. Looking at an enlarged photo I became more interested in the ball like structures at the bottom. I have provisionally grouped them as 'Fungi and Lichen' but I am unsure what they are. Help please.