i>22 



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. 149. Pnndorina Morum. A, non-sexual colony (or ccEnobium) of 16 zoogoni- 

 dia ; a, red spot; b, transparent anterior end of zoogonidium, to which the two 

 cilia are attached. 



B, sixteen young sexual colonies about to leave the gelatinous wail. 



f^and f), colonies of sexual zoospores escaping. 



E, F, G, conjugating zoospores 



//, zygospore in test ins stage (red). 



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

 epore. 



L, new colony formed by the division of K, very young stage. 



Af, the same colony as L, in a further stage of development. After CErsted. 



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

 protoplasmic contents escape as a ciliated swarm-spore (K, 

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



