EXPLANATION OF PLATES 53 
EXPLANATION OF PLATES 1-5 
PLATE I 
Fic. r. A nucellus with two completed tetrads of megaspores, five of which are . 
germinating. 10. 
Fic. 2. Two tetrads of megaspores pesen the lowest spore of each tetrad 
i growing at the expense of the others. X2 
FIG. 3. An embryo-sac with but Na en between synergids and egg 
cell, and the antipodals partly shrunken 
\ FIG. 4. mature embryo-sac with an egg cell aani far below the synergids. 
X 210. 
Fic. 5. A normal egg apparatus. X 600. 
fi Fic. 6. An embryo-sac shortly after fertilization, ate one synergid, Sy, 
intact, the residual nucleus, R, and migrating nuclei, E, ich have resulted from 
free divisions of one daughter of the primary endosperm antl X 105. 
E Fic. 7. Whole upper portion of an embryo-sac shortly after fertilization, 
showing the spa cap, N. ee two pene nous Sy, the aes AOA ah t e 
egg nucleus, E, th 
E| at P by the division of cells. X 210. 
F Fic. A pro pei with a divided suspensor, Su, and a four-celled embryo 
le (One cell autively cut aw 
i Fico A arhin egg, E, and two synergids, Sy, imbedded in one large endo- 
À sperm cell. 
FIG. 10. Py aitia with one large suspensor cell, Su, and three embryo-cells 
H resulting from nearly transverse divisions. X 210 
IG. Ir. Upper end of an embryo-sac showing remnants of nucellar cap, N.C., 
path of the pollen puge PT, and proembryo consisting of one suspensor cell, Su, and 
il one embryo cell. E, E, E are the uppermost cells of the young endosperm. X 210 
FIG. 12. A proembryo with the suspensor cell, Su, divided before the first divi- 
| sion of the embryo cell has occurred. X 210. 
i FIG. 13. A proembryo showing a divided suspensor and two embryo cells 
Papen from a vertical division. Sy, persistent synergid. PT, path of pollen tube. 
xX 2 
ulti 
A proembryo with single suspensor cell, Su, t 
from a vertical division, the whole surrounded by the two ppum apa panig 
FIGS. 15, 16. Single berries from spike in Fig. 21. X 
G. 17. Longitudinal section of a berry, showing seeds in position. X I. 
FIG. 18. Cross section of a berry with five seeds. 
XI 
Fic. 19. Upper portion of a pirtillate spike and hiik sterile spadix. X I. 
x 
Fic. 21. A mature spike or fruit cluster with a few berries removed. X I. 
Fic. 22. A pistillate spike with a few isolated staminate flowers, male, above. 
IG. 23. A spike chiefly pistillate, with staminate flowers at both top and 
KT 
PLATE 2 
24. Section of inner stigmatic brush and adjoining parts of the ovary, 
led 42. 
Fic. 25. Meristematic region, M, just above the lower border of the endosperm. 
