974 



XIV. ALGiE. 



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 -roVo ^^'^ furnished with two 



Hydrocytium acumi- 



natum. Older, and 



stiortly before the exit 



of the zoospores. 



Acelabularia medUerranea. 



Sciadium Arhu^cula. 

 Single plant producing several families of 

 indiTlduals Bpringing from each other, 

 (A. Braun.) 



Sciadium Arhuscula, 



Young branches of 



the third generation, 



open at the top to 



allow of the passage 



of the zoospores. 



Hydrocytium acuminatum. 

 Zoospores leaTing the plant. 





0' 



Ifydivcytium. Zoospores. 

 (A. Braun.) 



Acelabularia 



mediUrranea. 



Ray showing the 



zoospores. 



Yaucheria. 



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



at the moment of the concentration of the green 



matter ; c, the same at the exit of the spore, d ; 



a', cornicula and anthcTOZoids ; s, pporangia. 



