Folsom: morphology of yucca glauca 435 



32. Embryo sac after discharge of male nuclei and before double fertil- 



ization : f , fusion nucleus. X 300. 



33. Micropylar end of preceding: e, egg apparatus; m, male nuclei; n, 



nucellus (diagrammatic). X 1225. 



34. Micropylar end of embryo sac after fertilization: e, egg; s, synergid. 



X 700. 



35. Ovule containing preceding. X 72. 



PLATE XLVI 



36. Micropylar end of embryo sac containing proembryo and one endo- 



sperm nucleus ; nucellus diagrammatic. X 300. 



37. Embryo sac containing preceding. X 45. 



38. Cross-section of carpel : e, embryo sac of fig. 37. X 2^. 



39. Embryo surrounded by endosperm tissue with walls. X 300. 



40. Full-sized ovule containing embryo in stage of preceding: e, embryo 



sac. X 2y2. 



41. Outlines of thirty-six chromosomes in anaphase in endosperm cell of 



preceding. X 1225. 



42. Long-section of embryo from full-sized ovule : n, nucellus. X 72. 



43. Cross-section of embryo from full-sized ovule : n, nucellus. X 72. 



