Lichen

Lichens are not plants; they are symbiotic colonies of fungus and blue-green algae, and they look like alien landscapes. They can survive the most extreme conditions, and can indicate pollution levels- the cleaner the air the more types of lichen will thrive. It’s easy to overlook lichen, but this twig caught my eye… a happy indicator of good clean air. More info on how the fungi and algae live and work together can be found here.

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