CABPOPHTTA. 



181 



therozoids. Each antherozoid is a long spiral thread of 

 protoplasm, provided with two long cilia at one end, by- 

 means of which they swim rapidly through the water. 



Fio. 99.— A Stonewort (Chara orinita). One half the natural size. (From Allen.) 



379. Fertilization takes place by the antherozoids swim- 

 ming down the opening' at the top of the covering cells 

 (Fig. 100, e). The carpogone and its covering now become 



/] 



9° 



Fia. 100.— Sexual organs of a Stonewort (Chara fragilis). a, an antherid; s, 

 spore-fruit; c, its crown of Ave cells; 6, fragment of the leaf which bears the 

 sexual organs; /3, bracteoles. Magnified about 33 times. 



