Brogue Wiki
luminescent fungal growth fills the area, groping upward from the rich soil.

Luminescent fungus is similar to other types of fungus except for the fact that it is luminescent, which is probably why it is named luminescent fungus.

It is flammable, but fire spreads more slowly through luminescent fungus than drier vegetation and may stop before consuming an entire patch.

Be careful around it if you like to sneak because it will light you right up.