Natural pattern on limestone rocks where black lichen has colonised cracks on the surface, east side of Caswell Bay on Gower, August 2018
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Jessica's Nature Blog 
I think you just solved a mystery for me. I can no longer find a particular mark on a granite glacier erratic that I visit frequently. I couldn’t figure out what happened to it. But now I think it may have been been black lichen, and it may have been scoured out over the winter, or maybe just heavy rain or high water in the river beside it. Thanks!
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I am pleased you were able to solve the mystery, Linda. Lichens get everywhere and alter colour, texture, and often enhance the appearance of many rocks. Ultimately they can be destructive because some of them not only settle on the surface but actually penetrate the substrate.
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