Observations on Megasporogenesis and Megagametophyte Development in Paulownia sp and Sesamum indicum by Enzymatic Maceration Technique Origin of Megagametophytes with Supernumerary Egg Cells Occurring in Oryza sativa Abnormalities Occurring during Female Gametophyte Development Result in the Diversity of Abnormal Embryo Sacs and Leads to Abnormal Fertilization in indica/japonica Hybrids in Rice OBSERVATIONS ON THE DEVELOPMENT OF FRITILLARIA TYPE OF EMBRYO SAC IN LILIUM LANCIFOLIUM BY MEANS OF ENZYMATIC MACERATION Further Studies on Microtubule Organizational Changes During Megagametogenesis in Rice Embryo Sac Ovule Development and Major Developmental Events Distribution in Cymbidium faberi