223 



BOTANY. 



act, is that within a short time a thick coat of cellulose is 

 formed over the new cell, thus producing a zygospore {H, 

 Fig. 149). After a long period of rest, these zygospores 





Fig. H^.—Pandorina Morum. A, non-sexual colony (or coenobinm) of 16 zoogoni- 

 dia ; a, reel spot ; 6, transparent anterior end of zoogonirtium, to which the two 

 cilia are attached. 



.B, sixteen young eexiial colonies about to leave the gelatinous wall. 



<7and 7>. cnlonieB of sexual zoospores escaping. 



B. F, G. conjugating zoospores 



-") zygoepure in resting stage (red). 



J, A, germinating zygospore, the contents escaping as a large red ciliated swarm- 

 epore. 



L. new colony formed by the divii<ion of K. very young siage. 



Jf, the same colony as i, In a further stage of development.— After (Ersted. 



germinate by the bursting of the coat (exospore), when the' 

 protoplasmic contents escape as a ciliated swarm-spore (A", 

 Fig. 149). After swimming about for some time, the swarm- 



