i g 2 o] KA XDA — VERB EX. I 7 1 



PLATE IX 



Figs. 46-53 magnified 800 diameters; figs. 64-68 magnified 700 diameters; 

 figs. 50, 68 are V. hastata; figs. 64, 65, V. stricta; figs. 66, 67, intermediate form 

 between V. stricta and V. hastata; all others are V. angustifolia. 



Fig. 46. — Embryo sac separated into micropylar and antipodal chambers: 

 nucleus in micropylar chamber just in mitosis; reconstructed from 4 sections. 



Fig. 47. — -Embryo sac in which endosperm tissue is developing from 

 micropylar end; single large undivided nucleus with 2 nucleoli in antipodal 

 chamber. 



Figs. 48, 49. — Two portions of one embryo sac: fig. 48, antipodal chamber 

 still i-celled; fig. 49, micropylar chamber filled with tissue. 



Fig. 50. — 'Embryo sac retarded in development by absence of starch in 

 jacket ; only 3 nuclei in center. 



Fig. 51. — Mitosis of endosperm nucleus in antipodal chamber. 



Figs. 52, 53. — Two parts of more advanced embryo sac: fig. 52, antipodal 

 part with one large resting cell; fig. 53, micropylar part with filamentous 

 embryo. 



Figs. 64, 65. — Pollen mother cell in reduction division: fig. 64, metaphase 

 of first division; fig. 65, early telophase of second division. 



Figs. 66. 67. — Pollen mother cells: fig. 66, metaphase and telophase of 

 first division; fig. 67, telophase of second division. 



Fig. 68.— Pollen mother cell in telophase of second division. 



