176 BOTANICAL GAZETTE [MARCH 
Fic. 4. S. fetiolaris. Mature pollen grains of a sport. 
Fic. 5. S. fetiolaris. Portion of microsporangium of sport. 
Fic. 6. S. petiolaris. Portion of microsporangium of sport. Irregular 
development. 
1G. 7. S. fetiolaris. Portion of microsporangium of sport. 
Fic. 8. S. cordata. Portion of microsporangium of normal anther. 
Fic. 9. S. cordata. Later stage of development than fg. 8. 
PLATE XIII. 
S. glaucophylla. 
Fic. 10. Apex of nucellus with single archesporial cell. 
Fig. 11. Apex of nucellus with two archesporial cells 
Fic. 12. Apex of nucellus before the differentiation of the archesporium. 
Fic. 13. Nucellus showing macrospore mother cell and primary tapetal 
1G. 14. Typical nucellus with one fertile macrospore, one potential 
macrospore and three tapetal cells. The nucleus of the fertile macrospore is 
accompanied by two centrosomes. 
Fig. 15. First division of the primary nucleus of the macrospore; one 
potential macrospore ; two tapetal cells. 
Fig. 16. Second division; one potential macrospore; one tapetal cell. 
Fic. 17. One fertile macrospore; two potential macrospores ; four tapetal 
cells. 
Fics. 18, 19. First division ; one potential macrospore ; three tapetal cells. 
Fig. 20. Second irom showing transverse oo spindle and lon- 
gitudinal antipodal sp 
FIG. 21. Bence rome ae of macrospore. 
FiG. 22. Irregular development ; the micropylar nucleus has probably not 
ivided. 
Fig. 23. Third — showing position of spindles. One — or pair 
of nuclei has washed ou 
ee 
wi 
“PLA re E x1. j 
Pu 25. 5: glancophylla. Qos; in form: nucleolus « of | pri- 
mary endosperm nucleus very dense: ‘nerd mile distinct ; aiform 
se sett well —— 
‘Fic. 24. Second division; unusual slesechictien: of nucellar tissue for —_ fe 
