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OBSERVATIONS ON THE DEVELOPMENT OF MICROSPORANGIUM AND THE EMERGENCE OF MALE GAMETOPHYTE IN WATERMELON (CITRULLUS LANATUS) CHANGE OF CALLOSE WALL AND SPRO POLLENIN OF MICROSPORANGIUM ABORTION IN CUNNINGHAMIA LANCEOLATA Studies on the cell development and its function of microsporangium epiderm in Plantycladus orientalis The Development of Microsporangium and Microspore in Azolla Studies on the development of tapetum and middle layer of microsporangium in Platycladus orientalis Isolation and Purification of Megasporocarp and Microsporangium in Azolla ELECTRON MICROSCOPE OBSERVATION ON THE MICROSPORANGIUM DEVELOPMENT IN MALE-STERLIE PLANT AND MALE-FERTILE PLANT OF CUNNINGHAMIA LANCEOLATA