STUDIES OF THE DEVELOPMENT OF PEPEROMIA HISPIDULA 397 
Fig. 88. Similar section showing the single endosperm nucleus. Fusion is 
complete except for the lobing that indicates the composite origin of this nucleus. 
The nucleoli have already fragmented to form 26 nucleoli. Oospore with one 
double-sized nucleolus and a large, somewhat beaded chromatin net of apparently 
the same character throughout. X530. 
Fig. 89. Longitudinal section of an embryo sac a ad surrounding tissues, showing 
fertilized egg and one section of the single, much-lobed, endosperm nucleus. X480. 
Figs. 90-97. Successive longitudinal sections of the same endosperm nucleus 
that is shown in Fig. 89, showing details of the lobing and the aggregation of the 
chromatin along the lines of fusion of the constituent nuclei. X480. 
Fig. 98. Longitudinal section of sac showing the oospore and the first mitotic 
spindle of the endosperm nucleus, with part of its very numerous chromosomes. 
X530. 
Fig. 99. Similar section showing later phase of first mitosis of endosperm 
nucleus. The spindle has the usual, transverse position. X530. 
Fig. icq. Sagittal section of a half-mature fruit and its bract, showing oospore, 
endosperm, perisperm, integument and carpel, with its bristles and single vascular 
bundle, on the abaxial side. X55. 
Fig. ioi. Transverse section of a somewhat older fruit, showing perisperm, 
integument and carpel. X55. 
Fig. 102. Longitudinal section of embryo sac with oospore and 2 endosperm 
cells, showing the many nucleoli and the lobing of the endosperm nuclei. X480. 
Fig. 103. Transverse section of similar sac showing the first 2 endosperm 
cells, with their lobed nuclei. Numerous fat globules in the cytoplasm. X480. 
Fig. 104. Longitudinal section of sac with oospore and 4 endosperm cells. 
X480. 
Fig. 105. Transverse section of a sac with 3 endosperm cells having lobed, 
multinucleolate nuclei, and 2 periphenil cells with small nuclei having a single 
nucleolus each. The oospore and synergid (in dotted outline) are from an over- 
lying section. X480. 
Fig. 106. Part of a longitudinal section of an embryo sac showing the numerous 
chromosomes of the endosperm nucleus and two stages in the cell plate that is 
formed at each division of the latter. X 1,160. 
Fig. 107. Lateral view of surface of mature fruit. X55. 
Fig. 108. Sagittal section of nearly mature fruit. X55. 
Fig. io8(2. Part of the same section showing structure of an oil-cell. X520. 
Fig. 109. Transverse section of bristle of nearly mature fruit, showing the 
internal, slightly spiral thickenings. X480, 
Fig. lie. Longitudinal section of a mature embryo, endosperm and synergid. 
X225. 
Fig. III. Longitudinal section of germinating seed, showing elongated embryo 
still enclosed by the swollen, active endosperm. The upper part of the carpel is 
pushed off by the endosperm. The perisperm is partially exhausted of starch near 
the endosperm. X55. 
Fig. 112. Surface view of young seedling with cotyledons still embedded in 
the endosperm. (From a glycerine mount.) X25. 
