Mycena lux-coeli —meaning "heavenly light mushrooms"—is a bioluminescent species of fungus in the family Mycenaceae. It was first discovered in 1954 on Hachijō-jima where it is widely found, and decades later was found on multiple islands in Japan.

Mycena lux-coeli is a bioluminescent fungal species that is distributed in the warm regions of Japan, and its fruiting bodies can mainly be found on decaying Castanopsis sieboldii trees in June or September11). In nature, its pileus gills continuously emit green light, which can be easily observed by the naked eye in the dark, for

The Mycena lux-coeli mushrooms, known locally as shii no tomobishi-dake (literally, “chinquapin glow mushrooms”), sprout from fallen chinquapin trees. As they grow, a chemical reaction involving luciferin (a light-emitting pigment contained within the mushrooms) occurs, causing them to glow a ghostly green.