Hypomyces lateritius

A parasitic fungus infecting mushrooms of the genus Lactarius.

Appearing as a thin whitish subiculum that completely covers the host hymenium, in which globose to ovoid perithecia housing the asci are immersed.

Asci cylindrical, uniseriate, up to 150 µm long and 4-6 µm wide, inamyloid in Melzer's reagent.

Ascospores fusiform, with pointed ends, smooth, hyaline, thin-walled, containing abundant oil or lipid droplets inside.