98 BOTANICAL GAZETTE [FEBRUARY 
Fic. 7. Complete eon of the first division, showing the form of the 
chromosomes on the nuclear plate; 7a, a polar view of chromosomes as 
ranged on nuclear aie 
pak . Pollen mother-cell during an early anaphase of division. 
Fic. 9. Daughter nuclei with chromosomes distinct, but irregular in form; 
early stage of cell-plate formation. 
Fic. 10; Microspore nucleus in an early stage of segmentation. 
Fic. 11, Peculiar spindle of the microspore division. 
Fic. 12. Daughter nuclei resulting from the division of the microspore 
nucleus. 
1G. 13. Pollen grain with small generative cell surrounded by its court, 
but free in larger vegetative cell. 
1G. 14. Pollen tube showing sperm nuclei and deteriorating vegetative 
nucleus. 
PLATE Il, Peltandra undulata. 
FIG. 15. Nucleus in spirem stage. 
Fig. 16, An early stage in the segmentation of the chromosomes. 
Fic. 17. Radial arrangement of kinoplasm in pollen mother-cell ; chro- 
mosomes differentiated. 
1G. 18. Pollen mother-cell with kinoplasmic weft in the vicinity of the 
nuclear membrane at the time when the latter begins to disappear 
FIG. 19. A stage in the development of the rather indefinite ‘multipolar 
spindle; chromosomes occupying a central position. 
FIG. 20. ay spindle of the first division, also showing the separa- 
tion of the segment 
IG. 21. Het Ns nuclei resulting from the first division of the pollen 
mother-cell ; cell plate forming at the periphery. 
FIG. 22. Daughter cells showing the peculiar arrangement of the kino- 
plasm at the completion of the cell division. 
FiG. 23.’ A division of the microspore nucleus, showing the characteristic 
spindle. 
Fig. 24. An anaphase stage in the division of the microspore nucleus. 
