Illuminatus Frondensia, named for its illuminated, frond-like branching, is a bioluminescent fungus in deep caves. It features coral-like fruiting bodies 10-25 cm tall, with frondose caps having wavy margins and smooth to finely tuberculate surfaces in cream, pale pink, and yellow hues. Slender pale stipes sway gently, aiding spore dispersal. Its blue-green bioluminescence (470-530 nm) arises from a luciferin-luciferase system in cap margins and undersides. Found on cool, humid cave substrates rich in decaying lignocellulosics, it functions saprotrophically. Taxonomically, it is in Xylariaceae, genus Illuminatus, order Xylariales. Its mycelial network sustains nutrient cycling and cave ecosystem health. A rare, protected species, it exemplifies cave-adapted bioluminescent fungi diversity and ecological importance.