Also found in: Dictionary, Thesaurus, Wikipedia.


Herbal medicine
Any of a family of lichens that contain usnic acid, which is believed to have antibacterial, immune stimulatory and muscle relaxing activity. Lichens are used topically for athlete’s foot and skin ulcers; as a douche for vaginal infections; and internally for colds, flu, sore throat and gastrointestinal, respiratory and urinary tract infections.

It should not be used in pregnancy, as it stimulates uterine contraction.

usnea (usˑ·nē·),

n Latin name:
Usnea barbata; part used: entire lichen; uses: common cold, cough, sore throat, infection, an antibiotic; precautions: pregnancy, lactation. Also known as
old man's beard.
References in periodicals archive ?
Stictic acid derivatives from the liehen Usnea articulala and their antioxidant activities.
The lichen genus Usnea (Parmeliaceae) in the tropical Andes and the Galapagos: species with a red-orange cortical or subcortical pigmentation.
of new locations locations 2006 2013 Lobaria puimonaria 39 72 33 Nephromopsis iaureri 16 25 9 Bryoria fremontii 2 2 0 Lichenomphaiia hudsoniana 3 3 0 Fiavoparmeiia caperata 1 3 2 Fiavopuncteiia fiaventior 1 1 0 Heterodermia speciosa 7 21 14 Sticta wrightii 1 2 1 Anaptychia ciiiaris 9 11 2 Cetreiia cetrarioides 7 13 6 Fiavopuncteiia soredica 3 6 3 Lobaria scrobicuiata 8 9 1 Parmeiina tiiiacea 2 3 1 Usnea iongissima 3 6 3 Total 102 177 75 Table 2: The spread of protected lichens species in the Perm Territory.
One good Usnea product I've found is a tincture made by HerbPharm.
Camuflaje, liquen arbustivo, Usnea, Phaneropterinae, grupo holofiletico, simpatria, neotropico
Key Words: Sitophilus granarius; Usnea longissima; Lichen extracts; Insecticidal effects
Animals' Apawthecary Eye & Nose Herbal Drops contain sodium chloride, boric acid, sodium borate, and extracts of certified organic goldenseal, eyebright, and usnea.
Lisa's lichen was previously only known by its Latin name, Usnea florida.
Other newly named endangered species include queen's executioner beetle, sea piglet shrimp and witches' whiskers lichen, Arrhis phylonyx and Usnea florida, respectively.
Other newly-named endangered species include queen's executioner beetle, sea piglet shrimp and witches' whiskers lichen, which were previously known as Megapenthes lugens, Arrhis phylonyx and Usnea florida, respectively.
Usnic acid and diffractaic acid as analgesic and antipyretic components of Usnea diffract.