Covering of lichens growing on a granite boulder in the North Cascade Mountains of the Pacific Northwest, in Washington State.

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Photo credit: © Wend Images / Alamy / Afripics
License: Royalty Free
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Keywords: ancient, backgrounds, biological, biology, biota, botanical, botany, categorization, category, covering, environment, environmental, eroding, genera, growth, habitat, hard, latin, lichen, lichens, life, living, natural, nature, organic, organism, outdoors, patterned, patterns, range, rocks, rugged, species, subspecies, textural, texture, textures, uneven