Old Man's Beard, Beard Lichen, Treemoss, Methuselah's beard lichen (Usnea spec.), at the twigs of a spruce


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Photo credit: © blickwinkel/Hecker / Alamy / Afripics
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Keywords: ., beard, bioindicator, bioindicators, branch, branches, coaction, commensal, conifer, coniferous, conifers, dependence, ecology, epiphyte, epiphytes, format, hecker, index, indicator, interaction, lichen, lichens, man, methuselah, organism, organisms, partnership, plant, plants, spruce, spruces, symbiosis, symbiotic, tree, treemoss, trees, twig, twigs, usneaceae, vertical, woody