384 BOTANICAL GAZETTE [November 



Fig. 5 



Fig. 6 

 Fig. 7 

 Fig. 8 

 Fig. 9 



Four-nucleate embryo sac. 



■Division to form eight nuclei. 



Megaspore mother cell dividing equally; distinct wall formed. 



•Wall has disappeared; vacuole has formed. 



Unusual arrangement of nuclei and vacuoles; nuclei in this case 



have gone into resting condition. 



Fig. 10. — Division to form four nuclei; distinct cell plates formed. 



Fig. 11. — Four-nucleate embryo sac (four megaspore nuclei): walls have 

 disappeared. 



Fig. 12. — Eight-nucleate embryo sac. 



Fig. 13. — Double fertilization. 



Fig. 14. — Young proembryo: endosperm nucleus and antipodals dis- 

 organized. 



Fig. 15. — Proembryo. 



Epidendrum verrucosum Sw. 



Fig. 16. — Filamentous proembryo. 



Epidendrum cochleatum L. 

 Figs. 17, 18. — Two stages of the proembryo. 



PLATE XXII 



Phajus grandifolius Lour. 



Fig. 19. — Synapsis in megaspore mother cell. 



Fig. 20. — Functioning megaspore: other daughter cell and megaspore 

 disorganized. 



Fig. 2 1 — Micropy lar nuclei dividing; chalazal nuclei remaining undivided. 



Fig. 22. — Six-nucleate embryo sac. 



Fig. 23.— Same: egg apparatus formed; chalazal nuclei and micropylar 

 polar fusing. 



Fig. 24. — Fertilization: second male nucleus associating with other free 

 nuclei of the sac. 



Figs. 25, 26.— Proembryo showing micropylar cell growing out as a 

 haustorium. 



Fig. 27. — Proembryo from mature seed. 



Corallorhiza maculata Raf . 



Fig. 28. 



dividing; outer 



daughter cell disorganizing. 



Fig. 29. — Four-nucleate embryo sac. 

 Fig. 30. — Micropylar nuclei dividing. 



of sac. 



Fig. 31. — Six-nucleate embryo sac: micropylar polar has migrated to 



fusing. 



Fig. 32.— Fertilization has occurred; second male nucleus lying near egg. 

 Fig. 33.— Young proembryo: second male and other free nuclei of the sac 



