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Usnea spp.
Pale greenish-grey hair-like lichens hanging in draped tresses from conifer branches in Alberta's montane and boreal forests. Several Usnea species are native; collectively called Old Man's Beard. Highly sensitive to air pollution — abundance is a reliable indicator of clean air. Historical medicinal use (usnic acid is mildly antibacterial), but harvest only fallen windfall.
Quick Facts
Distribution
Boreal, Foothills, Mountains, Zone 2
Light
Grows on tree branches in part shade
Bloom Time
Non-flowering (lichen)
Soil
Grows on tree branches, not soil
Water
Absorbs moisture from humid air
Use Caution— Generally safe but usnic acid can cause GI upset if consumed in quantity
Growing & Cultivation
Propagation
Cannot be cultivated. Support by preserving clean-air forest habitat.
