Luminarius Nocturnus, meaning 'night luminous one,' is a bioluminescent fungus in the Pyroglow Ignis cluster, family Mycenaceae, genus Luminarius. It has robust, funnel-shaped fruiting bodies (15-40 cm) with deep blue caps featuring reddish-orange bioluminescent pustules. The translucent stipes and densely packed lamellae emit a golden-orange glow (470-530 nm) via a luciferin-luciferase reaction localized in gills and stipe cortex. Stipes are solid, nodulose, and phototropically orient toward light. It inhabits tropical rainforest understories (0-20°C), decomposing woody substrates as a saprotroph. Spore dispersal occurs through airborne basidiospores from lamellae, supported by an extensive mycelial network in humic soil and wood, marking it as an ecologically vital, stable decomposer adapted to dense understory niches.