According Wikipedia:
[Daldinia concentrica] is a useful form of tinder for fire-lighting. The brown variety is
usually too heavy and dense to be much good; the black variety is
lighter and better. It does need to be completely dry, whereupon it will
easily take a spark from a firesteel. It burns slowly, much like a
charcoal briquette, with a particularly pungent smoke. Once lit it is
quite difficult to extinguish, but fragments can be broken off and
transferred to a tinder ball to create an open flame.

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