Educational information, not medical advice — ask your doctor or midwife.
Punctelia borreri is a lichen that grows on tree bark and stone. It is not a plant, and it is not a mushroom. A lichen is a partnership between a fungus and an alga.
It forms flat, grey-green lobes with small white dots on the surface. The underside is dark, with root-like holdfasts. It is common in mild, damp parts of Europe, Africa, Asia and the Americas.
You may see it grouped under "medicinal fungi". That grouping is about biology, not about proven use. No human studies support taking this lichen for any health problem.
It has no clear folk record of its own under this name. Long use of other lichens is not proof that they work, and it is not proof that they are safe. Treat this page as a map of what is unknown.
There is no proven way that this lichen acts in the human body. Nothing here has been tested in people.
Lichens make strong acid-like compounds to fend off insects, germs and sunlight. In test tubes, extracts of related lichens slow the growth of some bacteria and fungi. Whether that happens on human skin or inside the gut is not known.
In laboratory tests, the same kinds of compounds mop up free radicals, which are unstable particles that can damage cells. A test-tube antioxidant result does not mean a benefit in a person.
Some lichen acids appear to block certain enzymes in cell studies. The doses used in those dishes are often far higher than anything a person would take. So the finding tells you little about real use.
This lichen is not a normal supplement, and most people will never see it for sale. There is no standard product and no quality standard.
Where it does turn up, it may be as:
- Dried whole lichen sold to collectors or researchers. - Crude alcohol or water extracts made for laboratory screening.
- Reference samples in herbarium and museum collections. - A minor part of mixed lichen material gathered for dyes or scent.
Some lichens are used in perfume, not medicine. Those scent extracts are restricted in several countries because of skin allergy.
Because no maker tests this species for strength or purity, any sample is an unknown. Lookalike lichens are easy to confuse with it.
No documented healing tradition names this lichen as its own remedy. It appears in name lists and in lichen chemistry work, not in old medical texts.
Other lichens do have a past. Iceland moss was boiled for coughs and poor appetite in northern Europe.
Usnea was laid on wounds in several folk settings. Oakmoss was used for scent.
Much of this history rests on how lichens look or where they grow, not on testing. Healers also valued lichens as dyes and as famine food.
These records describe what people did in the past. They are not advice, and they do not transfer to this species.
Stop using it and speak to a doctor if a rash, itch or swelling starts.
Get urgent medical help for any of these:
- Yellow skin or yellow eyes, dark urine, or pale stools. - Pain under the ribs on the right side, with sickness or deep tiredness. - Swelling of the lips, tongue or throat, or trouble breathing. - Vomiting that will not stop, or blood in vomit or stool.
Also see a doctor if the symptom you were treating is not improving. An untested lichen is a poor reason to delay care that works.
Punctelia borreri is not approved as a medicine in the UK, the EU, the US, Canada or Australia. It is not an authorised food or novel food in the EU, and it is not a standard supplement ingredient. Lichen scent extracts such as oakmoss face EU cosmetic limits because of allergy risk. Collecting lichen is restricted in many parks and reserves.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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