FIGURE 4. Megasporogenesis and female gametophyte development. A, T in Embryology of Myosoton and Stellaria and its taxonomic significance (Caryophyllaceae)

FIGURE 4. Megasporogenesis and female gametophyte development. A, T: Stellaria pallida; B–S: Stellaria media; A: Parietal cell and sporogenous cell; B: Anticlinal division of parietal cell; C: Periclinal division of sporogenous cell; D: Anticlinal division of sporogenous cell; E: Megasporocyte; F: Linear tetrad; G: Mononuclear embryo sac; H–I: 2-nucleate embryo sac; J: 4-nucleate embryo sac; K–L: 8- nucleate embryo sac; M–N: Mature embryo sac; O: The early stage of ovary; P: Ovary dissepiments degeneration; Q: Mature ovules; R: The micropyle is formed by the inner integument; S–T: The ovules are centrifugally throughout the placenta and supported by the long funiculus.