Abstract:A pathogenic fungus Colletorichum gloeosporioides (Penz.) Sacc isolated from horned gallnut, a Chinese gallnut from Yunnan Province, was reported for the first time. Its morphological and molecular biological characteristics were identified, and its damage status and mycelium characters on gall and mydium were described. The pathogenic fungi Colletorichum gloeosporioides (Penz.) Sacc belongs to Melanconiales (Deuteromycotina: Coelomycetes).