UNIVERSITATIS LATVIENSIS - DSpace

Comparative table of the development of pol-
len and embryo-sac.
Explanation of figures.
1. Chromosomes in the pollen mother cells in division.
2. Pollen with the bridge of plasma.
3. The anther, early stage of development.
4. Tetrarle division of pollen.
5. The aether, a little older than in figure 3.
6. Differentiation of sporogenous cells and vascular tissue.
7. Differentiation of tanetum cells.
8. Embryo-sac, early stage of development.
9. Embryo-sac, early stage of development.
10. Embryo-sac, mature stage.
11. The excrescenses of antipodal cells.
12. Embryo-sac, stage of 8 nuclei.
13. Embryo-sac with developed integuments.
14. Embryo-sac, stage of two nuclei.
15. Embryo-sac with the vacuole in the middle of the cell.
16. Initial cells of the integuments.
17. Embryo-sac with integuments in development.
18. Division of nucleus in the diploid cells.
Literature.
1879. Vesque, M. J. Nouvelles recherches sur le dēveloppement du sac em-
bryonaire des Phanērogames angiospermes. Ann. des Sc. nat. Botan-
nique. Tome Vlll.
1906. Huss, H.A.Beiträge zur Morphologie der Antipoden.
tralblatt. Band. XX.
Botanisches Cen-
1915. Tahara, M. The chromosomes of Papaver. Bot. Magaz. Tokyo. Vol 29.
1921. Yasui, K. On the behaviour of chromosomes in the meiotic phase of
some artifically raised Papaver hybrids, Bot. Magaz. Tokyo. Vol. 35.
1923. Tischler, G. Allgemeine Pflanzenkaryologie.
1922. Ljungdahl, H. Zur Zytologie der Gattung Papaver.
Tidskrift. Bd. 16.
130
Pollen. Embryo-sac.
Early stage of development of
anther.
Differentiation of sporogenous
tissue.
Differentiation of tapetum cells. Early stage of development.
Prophase of pollen mother cells.
Tetrad division.
Formation of pollen. Integuments and differentiation
Pollen binucleate.
of embryo-sac mother cell.
Embryo-sac with 2 nuclei.
Svensk Botanisk
1924. Schür hoff, P. N. Zytologische Untersuchungen in der Reihe der Gera-
niales. Jahrbücher für wissenschaftliche Botanik. Bd. 63.
1926. Schürhoff. P. N. Die Zytologie der Blütenpflanzen.
The remaining stages of the
development.