noun. A phosphorescent glow produced by certain bioluminescent fungi that grow on rotting wood.

noun. The phosohorescent light given forth by decayed or foxed timber.

noun. bioluminescence created by some types of fungus

"His first supposition was that it was a fungus growth known in the country as "foxfire," which gives out a phosphorescent glow in the darkness; but after watching and studying it for a long time, he was convinced it was something else."

argyle  brightly-colored  catskin  eltor  granddad