A crustose lichen on a branch that fell from a tree today.
I examined its spores under a microscope and inserted some photos of them into the image.
Their average size is 16.6 x 10.2 µm, so I think the lichen is a Brown-eyed Rim Lichen (Lecanora allophana).

#lichen #Lichensubscribe #macrophotography #microscopy #naturephotography