![](http://www.alamy.com/thumbs/6/E4ACCF59-5A16-4A04-9D25-BA56D55E6DB5/FA5JCN.jpg)
A crustose lichen, Pertusaria lactea, in the Italian Alps.
Size: 4897px × 3346px
Photo credit: © Bob Gibbons / Alamy / Afripics
License: Licensed
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Keywords: alpine, crustose, lactea, lichen, lichenised, lichens, pertusaria, plant, rock, saxicolous, symbiosis