740 
DUNCAN S. JOHNSON 
EXPLANATION OF FIGURES 
All figures are camera drawings and all are from microtome sections except figs. 
13, 25, 65, 68. 
The magnification given in the description of each figure is that actually shown 
by the figure as printed on the page. 
Abbreviations used: Ant, antipodal; Asp, archesporial cell or cells ; Br, sub- 
tending bract ; Cp, carpel or carpellary tissue; E, egg; Em, embryo; Esp, endosperm; 
lin, inner integument; Oc, oil-containing cell; Oin, outer integument ; Pa, parietal 
cells; Ps, pollen-sac; Psp, perisperm; St, stamen; Vb, vascular bundle. 
1 Part of longitudinal section of young spike, showing bracts and rudiments 
of stamens. X 75. 
2 Part of similar section of slightly older spike, showing rudiment of carpels 
and ovule. X 75. 
3 Part of section like last, through a stamen showing beginning of differentia- 
tion of the archesporium. X 350. 
4 Longitudinal section of flower through stamens and carpels. X 110. 
5 Transverse section of a bract and the two stamens of its flower. X 160. 
6 Transverse section of very young stamen. X 600. 
7 Transverse section of slightly older stamen, showing beginning of differen- 
tiation of archesporial and vascular tissue. X 350. 
8 Similar section of slightly older stamen, showing one archesporial group of 
cells at each end of the section. X 350. 
9 Similar section of still older stamen, showing two archesporial masses in 
one loculus and none in the other. X 350. 
10 Similar section of slightly older stamen, showing two archesporial masses 
(microsporangia) in each loculus. X 210. 
11 A single microsporangium from the stamen shown in fig. 26. X 350. 
12 Longitudinal section of a stamen, from a transverse section of a spike, 
showing microspores, tapetam, wall and line of dehisence. X 150. 
13 Surface view of part of spike, showing overlapping of bracts and the variable 
number of stamens and stigmas. X 10. 
14 Longitudinal section of stamen, from transverse section of spike. X 75. 
