1 9 1 4] MA R TIN— LEG U MINOS A E 167 



Fig. 36. — Embryo sac 8-nucleate, with large central vacuole and much 

 starch; X1500. 



Fig. 37. — Vacuole in embryo sac has disappeared; polar s in center of 

 sac; sac is divided into three separate portions; only one antipodal cell; 

 X1500. 



Fig. 38. — Mature embryo sac; polars in contact with egg apparatus; 

 nucellus has disappeared at the micropylar end; X360. 



Fig. 39. — Proembryo with 4-celled suspensor; X910. 



Fig. 40. — Advanced stage of embryo; embryo has cut off epidermis; 

 suspensor has thin cytoplasm and its cells are multinucleate; X 510. 



Fig. 41. — Advanced embryo with suspensor showing on hypocotyl; 

 X360. 



Vicia americana 



Fig. 42. — Young nucellus with 5 archesporial ceils; the integuments are 



appearing; X1500. 



Fig. 43. — Mother cell in synapsis; parietal cell has divided longitudinally; 

 X1200. 



Fig, 44. — A row of 4 megaspores; X750. 



Fig. 45. — Functioning megaspore; much parietal tissue has developed; 

 X1500. 



Fig. 46. — Mature embryo sac with nucellus eaten away; starch abundant 

 in the inner integument and remaining portion of nucellus; polars on inner 

 side of embryo sac and distant from egg apparatus; X540. 



Fig. 47. — The campylotropous ovule with mature embryo sac; X330. 



* 



Fig. 48. — A 2-celled proembryo; X1500. 



Fig. 49. — A 4-celled proembryo; apical cell produces the embryo; X900. 



Fig. 50. — Proembryo in a view showing only one cell of each pair of 

 cells composing the suspensor and the divided apical cell which produces the 

 embryo; X1200. 



Fig. 51.— Suspensor distinct from embryo; basal cells of suspensor much 

 elongated and multinucleate; the cells of the suspensor have very little cyto- 

 plasm; endosperm is parietally arranged; X1200. 



Fig. 52. — A 2-celled proembryo and 4 endosperm nuclei; X360. 



Fig. 53. — A 3 -celled proembryo and 8 endosperm nuclei parietally placed; 

 X360. 



