"Tinder is not dry wood"
Before cigarette lighters and matches to be created, they used to ignite fire the wick. This often means (wrongly accepted) "dry wood that burns well". Initially it used a mushroom for stirring the cinder - Fomes Igniarius - that grows on trees that gets older. Relatively hard hat under the skin of the fungus is a fibrous substance and must first have to be tanned for optimal use as tinder.