163 



sporum ramiflorum the antipodes have degenerated or have al- 

 together disappeared. 



The fruits of this species have not been examined. 



Pittosporum iimoi^ense. 



The tetradcells of Pittosporum raitiijiorum are lying in a row 

 in the normal way. With Pittosporum timorense this is quite 

 different. Here the four tetradcells are lying in two rows, each 

 of two cells. Of this figure 7 gives a picture. With this species 

 the nucellus is a little wider than in the other one. Sometimes the 

 tetradcells are distributed a little less regularly, but they are 

 never lying exactly in a row. In figure 8 a still mononucleated 

 embryosac is to be seen. The degenerating tetradcells are still 

 visible above the embryosac. Evidently one of the bottomcells 

 develops into an embryosac, which in a normal way will be- 

 come eight nucleated. The antipodes do not degenerate (figure 9). 

 Here as well the nucellus has degenerated. 



Of this species the fruit too was examined. The integument of 

 the young seeds has grown very much in size; of the development 

 of the embryo nothing could be seen. The development of the 

 endosperm on the other hand was easily to be discerned in 

 the shape of many free nuclei (figure 10). It si possible that 

 the embryo begins its development only in a later stage. 



Once I found a particular deviation in my sections. In one 

 case cells were visible proceeding from the first division of 

 two sporemothercells in one ovule. These sporemothercells had 

 been separated by a wall (figure 11). 



Consequently the following details deviating from the normal 

 type have been observed in this research. 



lo In both species the nucellus degenerates and in the full- 

 grown embryosac the nucellus has been destroyed. 



2o With Pittosporum ramiflorum the second tetradcell from 

 the bottom develops most probably into an embryosac. 



3o The shape of the tetrad of Pittosporum timorense deviates 

 very much from the ordinary type. 



Ann. .Tanl. Bot. Buitenz. 2c Ser. Vol. XIV. 12 



