265 
chalazal of which develops into a normal eight-nucleate 
embryosac. 
6. Sometimes two mother cells or two embryo 
sacs were found in the same nucellus. 
7. Double fertilization takes place. The fertilized 
primary endosperm nucleus divides before the female 
nucleus. 
8. The formation of the endosperm is at first by 
free nuclear divisions. A chalazal endosperm — pro- 
bably with a special function — is recognized. 
9. Various phenomena of degeneration in the ovu- 
les are described. The possibility of a stimulative par- 
thenocarpy is suggested. 
Lund, September 1921. 
Citierte Literatur. 
1916 Afzelius, K. Zur Embryosackentwicklung der Orchideen. (Sv. 
Bot. Tidskr. 10). 
1919 — , Zur Entwicklungsgeschichte der Gattung Gloriosa. (Acta 
Horti Bergiani 6). 
1920 — . Einige Beobachtungen über die Samenentwicklung der 
Aponogetonaceae. (Sv. Bot. Tidskr. 14). 
1915 ü’Angremond, A. Parthenocarpie und Samenbildung bei Ba- 
nanen. (Flora 107). 
1862 Bâillon. H. Note sur l’organogénie florale des Taccacées. 
(Adansonia VI.). 
1912 Bonnet, J. Recherches sur l’évolution des cellules-nourri- 
cières du pollen. (Archiv für Zellforschung 7). 
1899 Caldwell, O. W. On the life history of Lemna minor. (Bot. 
Gaz. 27). 
1907 Coker, W. C. The development of the seed in Pontederia- 
ceae. (Bot. Gaz. 44). 
1903 Coulter, J. M. and Chamberlain, Morphology of Angiosperms. 
New-York. 
1918 Dahlgren, K. Y. O. Die jüngeren Entwicklungsstadien der 
Samenanlagen von Typha latifolia. (Sv. Bot. Tidskr. 12). 
1911 Ernst A. u. Bernard, Ch. Beiträge zur Embryologie von This- 
mia clandestina Miq und Thismia Versteegii Sm. (Ann. Jard. 
Bot. Buit. 24). 
