Mycelium almost inconspicuous at the surface of infected insect, forms web-like fibers only at the broken parts of pupa's segments, but is abundant at the bases of stromata; it is white, yellowish or whitish-lemon. Hyphae thin-walled, 2-3.5 µm wide, branched, numerously septate. Stromata aggregated, 3-5 in groups, sometimes fused at the bases, 12-25 mm long, 1.5-2.5 mm wide, clavate, white or lemon-white, extending from the fore-part of mummified caterpillar. Fertile part 10-12 mm long, apical, clavate, well distinguishable from stalk by brighter color and black dots of extending ostioles of perithecia. Stalk cylindrical, solid, white, 1-2 mm wide.