Tinder Fungus is a type of fungus that holds a coal very well for a long period of time, and ignites easily. Tinder Fungus grows on live birch trees and looks like a blotch of blackened wood. It is rather hard. It resembles black bark that has peeled away slightly from the tree and thickened. The part that you use is inside the blackened outer layer, the red-brown material. It crumbles readily, so you can use it as part of tinder when making fire (or in a fire piston), or keep it in a whole piece for carrying a coal.
Tinder Fungus
