The light microscope was employed to observe the morphological and structural characteristics of ovary gall and leaf gall in Camellia oleifera.The results were as follows:(1)The proliferation of tender ovary and leaf infected by a fungus Exobacidium gracile resulted in the formation of hypertrophic fungus galls.The hymenium of E.gracile dispersed on the external surface of mature ovary galls and the surface of leaf galls.(2) Ovary gall developed from infected ovary of C.oleifera,and once reached maturation,the epidermis of ovary gall would exfoliate.(3)It was observed that the ovary gall wall consisted of two layers.The fleshy outer layer was mainly composed of large parenchyma cells,which were actually the main edible parts.The thinner inner layer of ovary wall was carpel containing several ovules attached on the axile placenta,while a large space occurred between the two layers.The ovules were empty and thus infertile.(4)Leaf gall was proliferative tissues of infected tender leaf and was made of large parenchyma cells.The epidermis of leaf gall covered both the upper and lower surfaces of the gall and fallen off when the gall matured.(5)The vascular bundles were found connecting the normal part and the leaf gall in the transition zone.The gall was 3~4 times thicker than normal leaf,and the gall cells were 5~10 times larger than normal leaf cells.No chloroplasts were observed in the gall cells.