24 



chronatophores , Each stjirch erain is rounded o • oval, usu- 

 ally with a dark center i no signs of lamination have been 

 observed (fig. ). Gt;,rch is especially abundant in 

 sporelings, and in the cells of the attaching orgcui (fig. 



). 



Besides the starch grains, there are nornially present 

 in the cytoplasm rounded masses of various sizes of v/h3,t 

 seems to be proteid inaterial. These spheres usually occtir 

 in Gmall groups, each group being surrounded by a clear 

 area. The groups seem to be especially abundant in the 

 cells at the time of nuclea.r division, and often simulate 

 miclei (fig. 12, ). Spheres of v/hat seems to be the same 

 ma,terial are usually present in the pads of protoplasm ly- 

 ing on the cross \/alls, a,nd small bits have been observed 

 lying in tjie cytoplasmic strands connecting neighboring 

 cells (fig. 6) . 



Cell division in Griffithsia is reiaarkable for the 

 disparity in the size of the daughter cells. It .'as first 

 described by 'WRIGHT (»79), whose account was supplemented 

 by the observations of BERTHOLD (»06). 



In the vegetative cells, division occiu's (1) by the 

 cutting off of daughter cells from the teruiinal cell of the 

 filament, (2) by the cutting off of small dome-shaped seg- 



