In this paper morphological change and development procedure of male/female flowers of masson pine was reported as follows: ① Male flowers: Male flowers, which were covered by bud scales, aggregated on the lower part of new shoot. It was found that male flowers were naked with scales open. Gynospore sac consisted of epidermis, middle layer, tapetum and sporogenous tissue. Tapetal cell was binucleated and gynospore quadrent was quadritaloral and symmetrical. During monokaryon phase the exhymenine stretched a...