Amadou

thumb|240px|right|Fomes fomentarius Amadou is a spongy material derived from Fomes fomentarius and similar fungi that grow on the bark of coniferous and angiosperm trees, and have the appearance of a horse's hoof (thus the name "hoof fungus"). It is also known as the "tinder fungus" and is useful for starting slow-burning fires. The fungus must be removed from the tree, the hard outer layer scraped off, and then thin strips of the inner spongy layer cut for use as tinder.

Amadou was a precious resource to ancient people, allowing them to start a fire by catching sparks from flint struck against iron pyrite. Bits of fungus preserved in peat have been discovered at the Mesolithic site of Star Carr in the UK, modified presumably for this purpose. Remarkable evidence for its utility is provided by the discovery of the 5,000-year-old remains of "Ötzi the Iceman", who carried it on a cross-alpine excursion before his death and subsequent ice-entombment.