107 



SUMMARY or RESULTS ')• 



I. Organogeny of the female flowers. 



The results obtained by Beccari, Strasburger and Karsten 

 are confirmed; the envelops which surround the nucellus arise 

 in centripetal direction. The female fl-owers in the purely female 

 inflorescences possess three , those in the pseudo-androgynous 

 ones two envelops. If in exceptional cases a female flower of 

 the pseudo-androgynous inflorescences develops further it pos- 

 sesses three envelops. Owing to the extreme rarity of such an 

 occurrence the development of this abnormality could not be 

 studied. 



The flower of Gnetum Gnemon L. is morphologically an 

 adventitious bud (Strasburger, Beccari). 



It is believed that the ovule is originated by direct transfor- 

 mation of the top of the bud-axis. The inner envelop is consi- 

 dered to be the only integument present. The two outer inte- 

 guments are two whirls of bracts which the author calls 

 perianth. The outer perianthwhirl contains stomata as does the 

 perianth of Ephedra after Jaccard's investigation. 



II. Fertilisation and embryogeny. 



Gnetum Gnemon forms several embryosacs in the way des- 

 cribed by Strasburger. In all, or nearly all the number of 

 nuclei increases. Generally but one attains full size. 



If no fertilisation occurs the embryosac becomes filled with 

 endosperm. 



The adult embryosac contains a large central vacuole sur- 

 rounded by a comparatively thin layer of protoplasm in which 

 numerous free nuclei , containing but little chromatin are seen. 

 Before fertilisation a constriction is seen in the Embryosac 



1) See: Lotsy. Resultate einer Untersuchung ueber die Embryologie v, Gnetum 

 Gnemon L. Bot. Centialbl. 1898. 



