Luminisporus Glacialis, from Latin 'luminis' (light) and 'glacialis' (icy), is a bioluminescent fungus in the Pyroglow Ignis cluster. It has slender translucent stipes (5–30 cm) topped with convex to slightly umbonate caps exhibiting pale icy-blue gills with orange flecks. Fruit bodies cluster on white mycelial mats decomposing woody Arctic substrates. Bioluminescence emits a warm yellow-orange glow (450-495 nm) at gills and inner stipe via a luciferin-luciferase reaction, attracting nocturnal Arctic invertebrates for spore dispersal. Thriving at 5–20 °C, it contributes to Arctic wood decomposition and nutrient cycling. Taxonomically, it belongs to order Agaricales, family Mycenaceae, genus Luminisporus (10 species). Spore dispersal is mainly passive via wind, aided by elevated stature. Its saprotrophic mycelium decomposes lignocellulose, sustaining Arctic ecosystems and reflecting adaptation to extreme cold.