GENERATIVE APPARATUS OF CHARA. 



341 



aspect ; and these enclose a central sac containing protoplasm, oil, 

 and starch- globules. At a certain period the spirally-twisted 

 tubes, which form a kind of crown around the summit, separate 



Fig. 159. 



Antheridia of Char a fragilis : — a, antheridium or 'globule' 

 developed at the base of pistillidium or 'nucule'; — e, nucule 

 enlarged, and globule laid open by the separation of its valves ; — 

 c, one of the valves, with its group of antheridial filaments, each 

 composed of a linear series of cells, within every one of which an 

 antherozoid is formed; — in d, e, and f, the successive stages of 

 this formation are seen;— and at g is shown the escape of the 

 mature antherozoids, h. 



