64 



A TEXTBOOK OF THEORETICAL BOTANY 



Reproduction 



Reproduction is both sexual and asexual (Fig. 40). Asexual reproduction 

 consists in the formation of daughter colonies within the cells of the parent. 



GAMETE 



WALL OF 

 COLONY 



WALL OF 

 CELL 



C? GAMETE '\'^'^^ V 

 (J 9 GAMETE 



Fig. 40. — Pandorina. Stages in reproduction. A, Mature colony. B, Colony of female 

 gametes. C, Male gamete. D, Female gamete. E, Conjugation. F, Zygote. G, 

 Resting zygote. H, Zoospore. J, Young colony formed from zoospore. 



Eudorina. Stages in reproduction. K, Mature colony. L, Detail of vegetative 

 cells. M, Detail of the emergence of flagella through the wall of the colony. N, Cell 

 destined to form antheridium. O to T, Stages in the formation of antherozoids. 

 U, Antherozoid. V, Conjugation of gametes. {After Fritsch.) 



Each cell divides into sixteen cells, which at first form a curv^ed plate. This 

 later becomes flat and then curves in the reverse direction, the corners meeting 



