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Crustaceous lichen. Thallus pale greenish grey to grey, often zoned at the margin, surface with often abundant, often (but not always) clearly delimited, round soralia that lack a bitter taste (compare with P. amara); apothecia rare.
Widespread on bark of deciduous trees, rarely on other substrates. Spotted on the trunk os a chestnut tree
Camera Model: NIKON D300. Exposure Time: 1/60 sec.; f/32; ISO Speed Rating: 200. Focal Length: 90.0 mm. Flash fired