Luminarius Aurantiacus, named for its light-bearing and vibrant orange color, is a bioluminescent fungus in the Pyroglow Ignis cluster (family Mycenaceae, genus Luminarius, order Agaricales). It features 10–25 cm tall convex to slightly funnel-shaped caps with translucent orange, glistening surfaces, and bright orange, decurrent gills fused to creamy-white, textured stipes. Found on decaying wood in tropical rainforest understories at 10–20°C, it emits greenish-yellow light (510–570 nm) via a luciferin-luciferase reaction mainly in cap and gill tissues, likely attracting nocturnal insects for spore dispersal. The gill structure optimizes spore release via phototropic growth. As a saprotrophic decomposer, it recycles lignocellulosic matter, sustaining nutrient cycles. Currently vulnerable, L. Aurantiacus highlights the ecological role of tropical bioluminescent fungi.