Lichen

Lichen

Observation - Lichen. Description: On ash, powdery, yellow-green, with a lighter grey rim around the edge. I wondered if it might be Chrysothrix candelaris, but it wasn't at all yellow. Or maybe Pyrrhospora quernea

On ash, powdery, yellow-green, with a lighter grey rim around the edge. I wondered if it might be Chrysothrix candelaris, but it wasn't at all yellow. Or maybe Pyrrhospora quernea