Foliose lichen growing on marble

Foliose lichen growing on marble

Observation - Foliose lichen growing on marble - UK and Ireland. Description: Rosettes of light grey foliose lichen joined together covering a sloping surface of a marble gravestone. Lobes overlapping in centres of thallus with lots of patches of soredia. Lecanorine apothecia have dark pruinose discs with blobby margins. Kept cha

Rosettes of light grey foliose lichen joined together covering a sloping surface of a marble gravestone. Lobes overlapping in centres of thallus with lots of patches of soredia. Lecanorine apothecia have dark pruinose discs with blobby margins. Kept changing mind but now think possibly Physcia caesia.