Lichen
From Wikimedia Commons, the free media repository
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 On spruce branch |
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 Lichen on a rock at Custer State Park, South Dakota, USA |
 Lichen covered rock, New England National Park, NSW |
 Rhizocarpon,on a mountain Zlatibor, Serbia |
 Xanthoria, lichen on a mountain Zlatibor, Serbia |
 Ochrolechia, lichen on a mountain Zlatibor, Serbia |
 Physcia, lichen on a mountain Zlatibor, Serbia |
 Evernia prunastri, lichen on a mountain Zlatibor, Serbia |
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