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I read about botany in my free time and learned that the spores of this plant, the stag's horn clubmoss, was used for flash. I know from seeing it on hikes that the spores fly off the things if you so much as brush past them. If you live in a part of the world where they're common you might consider foraging. I don't know details other than that it's highly flammable. I imagine other clubmosses work just as well.