974 



XIV. 



The antheridium first appears as a small horn (cornicula), filled with mucilage, 

 and placed by the side of a small rounded organ which acts as a sporangium ; the 

 antheridium contains in its apex antherozoids of ^ n< > furnished with two 



llyilrocytium acuimnatum . 

 Very young. 



SciaJium Aroustula 

 Zoospore with two 

 hiiirB. (A. Brauo.) 



l/iidrocytium arumi- 



natum. Older, and 



shortly before the exit 



of the zoospores. 



Acetabularia mnliten-anea. 



//ydrocytium atuminalnm. 

 ZoosporcB leaving the plant. 



\ / 



o < 



b 0' 



I/yilrocytium. Xoosi 

 (A. Brann.) 



Acetabularia 



medittrranea. 



Ray showing the 



zoogporeo. 



fu-iailiuiii Arbuscula. 



Single plant producing scveial families of 



individuals springing I row each other. 



(A. Braun.) 



Sciadiiim Arbuscula. 



Young branches of 



the third generation, 



open at the top to 



allow of the passage 



of the zoospores. 



Vaucheria. 



a, extremity of a young filament ; 6, the same older, 

 at the moment of the concentration of the green 

 matter ; r, the same at the exit of the spore, tl; 

 of, cornicula and antherozoids ; *, sporangia. 



