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Usnea sp.
Fructicose lichen. Many Usnea species have been described. Many of these are now regarded as morphological varieties and adaptations to local circumstances. The taxonomic categorization of many members of this genus remains uncertain. It is now noted as including more than 600 species and being one of the largest genera within the Parmeliaceae.
Holm oak forest
Usnea has been used medicinally for at least 1000 years. Usnic acid (C18H16O7), a potent antibiotic and antifungal agent is found in most species. This, combined with the hairlike structure of the lichen, means that Usnea lent itself well to treating surface wounds when sterile gauze and modern antibiotics were unavailable. It is also edible and high in vitamin C.
Spotted on Jun 13, 2012
Submitted on Jul 18, 2012
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