266 



BOTANICAL GAZETTE 



[SEPTEMBER 



Fig. 2.~Horm sira Banksii var 

 b'eben: mature oogonial plant. 



Mollet (6). These cells are very 

 gelatinous and are limited 

 below by a layer of parallel cells 



(fig- 4). 



There is no cavity in the node. 



An epidermis and cortical layer are 

 both present, and its center is 

 made up of parallel cells, which 

 divide into two strands as they 

 pass into the internode below. At 

 the distal end of the node there 

 seems to be a decrease in parallel, 

 cells as they merge into the anasto- 

 mosing filaments (fig. 5). 



The plant is dioecious. The 

 antheridial plants are readily rec- 

 ognizable on account of the bright 

 orange color. The conceptacles 

 are flask-shaped, and are sunken 

 in the outer tissues of the inter- 





node. From the few observations 

 made of the conceptacle, the de- 

 velopment seems to tally with 

 Bower's account (1) of its develop- 

 ment in the Fucaceae, where the 

 basal cell (b) and adjoining cells 

 contribute to the growth of the 

 conceptacle. In the figure. 

 Bower's "initial cell" shows a 



nucleate 



stage 



(fi 



5* 



6). A later 



stage of the conceptacle furnishes 



characteristic paraphyses (fi 



g- 



7), 



a few of which may persist in the 

 mature oogonial conceptacle, but 

 whose place is taken almost 

 entirely by hairs of a different 

 nature. 



