654 MINNESOTA BOTANICAL STUDIES. 
DESCRIPTION of PLATE XLVIII. 
Figure 1. Longitudinal section of ovule containing young embryo 
and endosperm (x50). The nucellar tissue about the middle of the 
embryo-sac has broken down. The antipodal body is seen at the 
lower end of the sac. 
2. Antipodal body (x 160). 
3. Eight-celled embryo (x 770). (Outlined with camera lucida. ) 
a = disorganizing synergid. 
4, 5,6. Longitudinal sections of ovules containing spherical embryos 
and endosperm ( X 240). 
7. Cross section of ovule containing a spherical embryo closely sur- 
rounded by endosperm ( x 240). 
8. Front view of an embryo at end of stage B. a=plumule, 66= 
cotyledon. This figure was reconstructed from careful micrometer 
measurements of serial cross sections; a proceeding found necessary 
in order to get the correct orientation of the embryo. 
g. Front view of an embryo at end of stage C. @=plumule. 66 
=cotyledonary lobe. Figure obtained in same manner as Fig. 8. 
10. Longitudinal section of an embryo in Stage C (x50). The 
endosperm is shrunken by reagents into the center of the ovular 
cavity. 
11. A fruit with one side of the pericarp and a cotyledonary lobe 
cut away (X2). @=thicker portion of the testa. 6=—common base 
of the cotyledonary lobes. 
ACE Ole oe 
12. Cross section of the hypocotyl of an embryo just completing 
Stage C (x50). 
13. Cross section of the same embryo through base of plumule 
CX 50). 
14. Cross section of the same embryo through apex of plumule 
(450). a@=apex of stem. d4=first leaf. e=endosperm. 
15. Cross section of an embryo, cutting plumule a short distance 
above its base (X50). e=endosperm. 
16. Cross section of same embryo through cotyledonary lobes 
(x50). e=endosperm. 
17. Longitudinal section of an embryo early in stage D (x65). 
The fundament of the first leaf is already evident, also the invagi- 
nation at the base of the embryo, which marks the position of the 
radicle. 
