This is natural. It always interests Boy Scouts when they see fungi
glowing in the woods. It is quite prevalent, at least here in
Pennsylvania. In a fungi, it is to attract insects to spread the
spores. Chemically it is the enzyme luciferase acting upon the compound
luciferin to break it down and release the energy as one photon of light.
There is information on this at:
There are also bioluminescent bacteria (Photobacterium), plants
(dinoflagellates) and insects (fireflies).
Pardon my spam deterrent; send email to firstname.lastname@example.org
Cheers, Steve Henning in Reading, PA USA
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