IQI2] 



YA MA NO UCHI—C U TLERIA 



453 



center, and usually two plastids whose position varies. 



com 



The 



Fig. 52 repre- 



cell showing 



of a male gametangium, each gamete mo 

 pigment spot in close association with 



nucleus. When the male gametes are mature 



of the free surface of the 



membrane of the mother cell 



dissolves so as to leave a 



small pore, through which 



the gametes are discharged. 



gametes 



from 



movin 



emerge 



gamete 



THE FEMALE GAMETANGIUM 



Mature female gam* 

 Female game tang 



are 



scattered over the whole sur- 

 face of the thallus, as in the 

 case of the male gametangia 

 fe- 5, 6, 7). The female 



gametangia are developed thallus with a number of filaments bearing 



Fig. 5. 



ifid 



alone 



or 



with 



hairs which appear upon the 



female gametangia in various stages of 

 development. 



gametan 



male Dlants, the hair and gametangium 



nate from superficial cells of the thallus. 



The mature female gametangium consis 

 female gamete mother cells, the number of tie 

 Each tier is composed of 4 or 8 mother eel] 

 of gametes from a single female gametangium 



and 56. 



more 



mature female gamete in the free swimming condition 



gametangium is oval (fig. 8, b), and usually contains 



plastids. The anterior end of the body of the female 



gamete is destitute of plastids and contains colorless granular 



