Some fungi are bioluminescent and glow in the dark to attract insects.

Imagine hiking through a dark forest and spotting eerie green lights on decaying logs. That's bioluminescent fungi at work, producing cold light via chemical reactions without heat. Over 130 species do this, mostly white rot fungi breaking down wood.

The glow often lights up gills, stems, or mycelium. In Japan, species like Mycena lux-coeli shine brightly on subtropical islands. This spectacle peaks in humid, rainy nights.

One leading idea: the glow attracts insects to spread spores. Light draws nocturnal bugs that carry spores away, aiding reproduction. Mycena chlorophos in Asia and Brazil glows vividly on forest floors.

Not all agree; some think it's a byproduct of metabolism. Yet, patterns suggest ecological roles, like luring springtails or millipedes. Research continues on this fungal flashlight strategy.

Mycena chlorophos, the green pepe, dazzles in Southeast Asia and India with bright gill glow on rotting twigs. Eternal Light Mushroom (Mycena luxaeterna) has spindly, glowing stems in Brazil.

Jack-o-lantern (Omphalotus illudens) glows orange-green in North America; Japan's Omphalotus japonicus lights stems. Panellus pusillus, the ping-pong bat, shows glowing pores globally.

Seek tropical forests, Western Ghats in India, or Japanese isles in wet seasons. Look on decaying hardwood logs in total darkness—flashlights ruin the view.

Species like Neonothopanus gardneri glow continuously for days in Brazil. Armillaria mellea, widespread honey fungus, has glowing mycelium. Respect habitats; many are rare or endangered.

Bioluminescence uses luciferin-like chemicals, similar across Mycena species but not identical. All are saprobic or parasitic decomposers recycling nutrients.

Genomics reveal multiple evolutions of glow. Conservation matters as habitat loss threatens these indicators of healthy forests. Future studies may unlock biotech uses.