The species of fungus produces very large fruit bodies which are shaped like a horse’s hoof and vary in color from a silvery grey to almost black, though they are normally brown.
It contains a spongy material used primarily as tinder, but also used to make clothing and other items. The 5,000-year-old Ötzi the Iceman (a well-preserved natural mummy) carried four pieces of this fungus, thought to be used for tinder.
It’s scientific name is Fomes fomentarius. The Latin word fomes means “tinder” or “touchwood” and the Latin word fomentarius means “material to feed a fire” – both the generic and species names emphasize the use of this fungus for fires.
It also has a long history of being used for a variety of medical purposes. Hippocrates in the fifth century BC described it as a “cauterization substance for wounds.” The fungus is credited with helping to stop bleeding. Due to this fact, surgeons at the time found use for it.
This species of fungus dwells on bark of trees. If not picked, it does not fall off the bark. It remains attached to the tree until it is dead; then it starts to initiate rotting of the tree bark. This often provides the beginning of a hole that birds which nest in tree cavities eventually use.