Fomitopsis Betulina

Fomitopsis betulina, commonly known as the Birch Polypore or Razor Strop Fungus, is a bracket fungus that exclusively grows on birch trees. Recognized for its smooth white cap and leathery texture, it has a long history of use in traditional medicine, wilderness survival, and even tool sharpening. While inedible in a culinary sense, it is highly regarded for its antibacterial, anti-inflammatory, and immune-boosting properties.

History

The Birch Polypore has been utilized since ancient times. Notably, it was found among the belongings of Ötzi the Iceman, a 5,000-year-old mummy discovered in the Alps. It is believed he used it for both medicinal purposes and as a fire-starting aid. Historically, barbers and craftsmen used dried slices of the fungus as a leather-like strop to sharpen razors and knives—hence the nickname "Razor Strop Fungus."

In folk medicine, it has been brewed as a tea to treat gastrointestinal issues, parasitic infections, and inflammation.

Overview

F. betulina produces hoof-shaped, shelf-like fruiting bodies with a smooth, white to gray cap and a porous underside. It typically grows in clusters on dead or dying birch trees and plays a key ecological role in decomposing hardwoods.

It is harvested, dried, and often made into tinctures, teas, or powdered supplements. Active compounds include betulinic acid, agaric acid, and triterpenes, which show potential antiviral and antimicrobial activity. It is not used culinarily due to its tough, corky texture, but it remains a staple in herbal and survivalist practices.