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Crustaceous lichen. Thallus a grey-white to pale-grey-green, cracked crust, usually without soredia but occasionally (f. soralifera, page pending) with small, yellow-green, spot-like soralia; apothecia small, black, concave to convex, when young with well-defined margins. An early colonist of smooth-barked trees, widespread and often very common.
On the bark of a young chestnut tree.
Camera Model: NIKON D300. Exposure Time: 1/60 sec.; f/32; ISO Speed Rating: 200. Focal Length: 90.0 mm. Flash fired