Bearded Usnea

This gray-green lichen, commonly found on old trees, yields potential health benefits while also lending itself well to other industries.

Quick Facts
General Information
  • Common name(s)Bearded usnea, beard lichen, tree moss, old man's beard, tree's dandruff, woman's long hair
  • Scientific nameUsnea barbata
  • Native regionNorth America
  • Main Economic UseCosmetics
Bearded Usnea

Bearded usnea is a lichen that grows on aging trees in forest areas across the Northern Hemisphere. The history of bearded usnea as a medicine goes back to at least 1600 BCE, when it was popular with Ancient Greek and Chinese healers. It is still used in Chinese medicine today, particularly in treatments for tuberculosis. In Europe, it is popular in commercial preparations because of its usefulness against bacterial and fungal infections, although it was not widely used by modern herbalists until a few years ago.

Medicinal and Nutritional Information

Quick Facts (Medicinal and Nutritional Information)
  • Medicinal actionAntimicrobial
  • Key constituentsUsnic acid
  • Medicinal rating(3) Reasonably useful plant
  • Safety rankingSafety undetermined

Health Benefits of Bearded Usnea

The antibiotic and antimicrobial properties of bearded usnea have found several traditional medicinal uses:

  • Treating urinary tract infections (UTIs)
  • Supporting the treatment of tuberculosis
  • Preventing wound infection

How It Works

Did you know?

Usnea is thought to be an effective antibiotic against at least 16 known strains of bacteria, including Streptococcus and Staphylococcus.

The main compound behind bearded usnea's health properties is the bitter usnic acid, which is known to soothe the stomach and enhance digestion. The organism also boasts immunostimulant and antibiotic properties, making it an excellent tool against immune disorders and other infections.  It appears to do this by disrupting the bacteria's metabolic function, although it does not adversely affect that of human cells.

Herbs like blueberry, parsley, and saw palmetto are also effective for treating urinary infections, whereas agrimony and cleavers provide similar wound healing benefits. 

Bearded Usnea Side Effects

Though it may have health benefits, usnic acid is also a suspected toxin. The Food and Drug Administration (FDA) is following up reports of liver damage as a direct result of ingesting the substance, and currently tests are being carried out to evaluate bearded usnea toxicity.

How to Consume Bearded Usnea

Through history, bearded usnea has been used for treating a wide range of health conditions. Nowadays, the herb can be found in medicinal forms which concentrate its medicinal benefits.


Main preparations: Liquid extract, capsules

Usnea capsules and liquid extracts can be bought and consumed for health purposes, and small amounts are currently deemed safe, although toxicity reports are not yet conclusive. Because of potential toxicity and side effects, a physician should be consulted before an usnea regimen is started.


Quick Facts (Buying)
  • Where to buySpecialized health stores, Online health stores

Liquid bearded usnea extract is widely available as a digestive aid and cure for common infections. Bearded usnea capsules are widely sold at health food stores and online where the product is marketed as an immune system enhancer. Care should be taken with usnea because the dose at which it produces toxic effects is not well established.

Dried usnea is often bought for decocting purposes.

Additional Information

Quick Facts (Additional Information)
  • Other usesCosmetics, Dye

Plant Biology

Bearded usnea (Usnea barbata) is bushy lichen, which has long stems, which look like a tangled mass of threads. It is a light gray-green color, and inside, there is a white central cord. This fruticose lichen typically grows on the trunk and branches of trees and shrubs.

  • Classification

    Bearded usnea hails primarily from North America and it is a member of the Parmeliaceae, which is the largest family of lichen-forming fungi and comprises over 2700 species across 79 genera.

  • Related Species

    Being a lichen rather than a plant, no varieties or cultivars of bearded usnea have been described or developed. However, there are approximately 87 species in the Usnea genus, many of which can be confused with Usnea barbata because they are similar in appearance. A few examples are U. dasypoga; U. rubicunda (red beard lichen), similar to U. barbata but red in color; and U. subfloridana, a very common lichen that is almost indistinguishable from bearded usnea.

Nineteen species of the genus Usnea are currently used as folk medicines all over the world.

Historical Information

Lichens were highly valued by the Ancient Greeks and made their way to European pharmacopeia in the early 14th century. By the late 1700s Usnea species were widely preferred for treating a variety of illnesses, from skin lesions, nausea, and diarrhea to smallpox and insomnia.

A decoction of Usnea spp. was used as an anti-inflammatory and skin moisturizer.

Usnic acid was first isolated by the German scientist W. Knop in 1844, but its uses were restricted to folk medicine until 1994, when it became commercially available. However, the industrial and medicinal uses of bearded usnea and usnic acid are yet to be certified by the Food and Drug Administration (FDA).

Economic Data

Usnea has commercial importance owing to its production of usnic acid. The bearded usnea market is mainly based around its industrial uses, particularly in the cosmetic and health industry. A substantial amount of money is made each year from the use of usnic acid in antibiotic preparations and as a bactericide in certain beauty products, such as deodorant.

Other Uses

Usnea species have long been used to produce dyes of different colors. Their antimicrobial and antifungal properties are also useful in the cosmetic industry, particularly in eastern countries such as China, Japan, Taiwan, India, and Europe where Usnic acid is formulated in creams, toothpaste, mouthwash, deodorants, and sunscreen products, either as an active principle or a preservative.