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Scandinavian preserved natural lichen, commonly called polar moss or reindeer lichen.Lichens are composite organisms arising from symbiosis between a fungus and a species of algae.
FS1205: Tree-Dwelling Lichens (Rutgers NJAES)
Lichen - Wikipedia
Field Notes: Learn About Lichen While the Wildflowers Sleep
Investigating Rehydrated Lichen - Wonder-Filled Days
7 – green lichen (photo by Greg Edinger) New York State Parks and Historic Sites Blog
For the Love of Lichens - Nature Alberta
Bachmann Europe plc - Spring Green Lichen,Spring Green Lichen
Lichen has a lot to tell you about your trees
Nature News: Why lichens appear green when it rains
