Abstract: Microstructural study was made on ovule development in Pennisetum squamulatum,and several prominent developmental and structural features were observed as follows:(1) Some nucellar cells become specialized by enlarging,elongating,and protruding into the micropylar canal,forming embellum.(2) There occurs a highly developed prietal nucellar tissue,which is derived from nucellar epidermis.(3) The micropyle is formed with inner integuments and partial outer integument.