5Q . THE BOTANICAL MAGAZINE. [Vol. xxix. No. 340. 



The case in Chr. coronarium affords a good explanation for 

 both views ; for in this plant the parallel arrangement and 

 longitudinal splitting can be seen at the same moment of the 

 maiotic prophase. 



Ill Tetrad Division. 



The type of the tetrad division of the pollen mother-cell of 

 Chrysanthemum is quite noteworthy. At the end of the maiotic 

 nuclear division, the new partition cell-walls appear in the form 

 of protuberances in the inner surface of the cell-wall of the pollen 

 mother-cells. These protuberances proceed centripetally and con- 

 strict the pollen mothercell into four equal portions. This type 

 of tetrad division reminds us of the type of tetrad division of 

 the tetraspore mother-cell in Rhodophyceae. 



IV Embryosac Mother-cell. 



The several embryosac mother-cells in the same ovule were 

 reported already by many authors in many Angiosperms. 

 Chrysanthemum presents, however, a vcr} 7 conspicuous example 

 in this respect. 



The table 1} in my above cited paper gives a general view of 

 my result of the investigation on this point. Chry. nipponicum 

 and Chry. Decaisneanum have only one embryosac mother-cell 

 in each ovule. But in other Chrysanthemums two or more 

 embryosac mother-cells are found almost always in the same 

 ovule ; especially in Chry. Marschallii, we met with five to ten 

 embryosac mother-cells in one and the same ovule. The maiosis 

 of these cells goes normally without any indication of disinteg- 

 ration. 



1) No. 339. p. (102.) 



