Luminaria Stardustica, named from Latin 'lumen' (light) and 'stardustica' (celestial stardust), is a rare stable bioluminescent fungus in the Galactic Mycelium cluster. It features medium fruiting bodies up to 15 cm tall, with convex to broadly flat caps having an undulate margin. The cap surface shows vivid iridescent violet-purple blending into a glowing amber underside. Adnate gills extend from a robust, reticulate stipe, attaching to decaying temperate woody substrates. Bioluminescence occurs at gill surfaces and cap margin, emitting blue-green light (450-495 nm) via a luciferin-luciferase system with pulsating intensity, likely aiding nocturnal spore dispersal. It thrives at 10-25°C, decomposing lignocellulosic material, contributing to nutrient cycling. Taxonomically, it is in Mycenaceae, genus Luminaria, order Agaricales. Wind-dispersed spores and extensive subterranean mycelium support genetic flow, decomposition, and ecosystem health.