foxfire

noun2

1. •
   (US) Bioluminescence created by some types of fungus, particularly those growing on rotting wood.

   • Perhaps you've seen a foxfire in the woods. Well, in the dark, it looks like a live, burning coal; but when you go to it, and take it up, it's only a piece of rotten wood. — 1874
2. •
   Wood exhibiting fungal bioluminescence; torchwood.