Figs. 16–20. Light micrographs of the mature female gametophyte of Platanus racemosa. All sections are longitudinal and are oriented with chalazal end toward top of page. Figure Abbreviations: A, antipodal cells; E, egg; F, fusion nucleus; FA, filiform apparatus; H, hypostase; SYN, synergid. 16. Female gametophyte with prominent hypostase, two antipodal cells and fusion nucleus in view. Scale bar = 50 µm. 17. Chalazal end of female gametophyte showing hypostase, elongated nucellar cells between female gametophyte and hypostase, and two antipodal cells. Antipodals are arranged with nuclei on chalazal side and vacuole at micropylar side. Scale bar = 10 µm. 18. Fusion nucleus. Scale bar = 10 µm. 19. Two synergids with prominent filiform apparatus. Scale bar = 10 µm. 20. Egg cell. Scale bar = 10 µm