Luminomyceta Nebulosa, meaning 'light-bearing mist,' is a rare bioluminescent fungus in the Galactic Mycelium cluster. It has medium-sized (5-25 cm) fruiting bodies with convex to broadly umbonate caps, moist wrinkled surfaces with translucent droplets, and closely spaced gills. Stipes are thick, semi-translucent, and internally luminescent. Caps and stipes glow blue (450-495 nm), while inner tissues emit orange-yellow light, indicating a complex luciferin-luciferase system in hyphae for nocturnal visibility. Found in tropical rainforest canopies at 10-20°C, it saprotrophically decomposes arboreal substrates. Taxonomically, it belongs to Mycenaceae, genus Luminomyceta, order Agaricales. Wind disperses basidiospores from bioluminescent gills. Its extensive mycelium anchors fruiting bodies and aids lignocellulose breakdown, vital for nutrient cycling. Its bioluminescence and structure define its ecological niche among ten cluster species.