Hmmmm, this article appears to imply it might already serve as an ignition source!
Tinder Fungus Description:
Tinder fungus is a fungal species that produce large, porous fruiting bodies that often resemble a horse’s hoof. They vary in color but are most commonly gray, black, or brown. The body can be from 2-17 inches across, 1-10 inches wide, and 1-10 inches tall. The mushroom is woody and hard, with a bumpy, rough upper surface and a cream-colored, porous underside.
Hosts:
This fungus grows on various tree species, but most commonly on hardwoods. In the North, birch trees have been found to be more susceptible, while beech trees are commonly infected in the South.
Biology & Symptoms:
Tinder fungus gets its name for its use to start fires. It is an active ingredient in Amado, which is a material used as tinder. Tinder fungus is a parasitic species that enters a tree through cracked bark or broken branches, causing decay or rot. Infected wood will likely show black lines, which is a common sign of decay. Tinder fungus can remain on its host for years, eventually turning from a parasite to a decomposer once the tree has died.
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Tinder Fungus: Identification, Prevention & Management | Davey Tree