233 



BOTANY. 



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

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

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



<iJi);f»»|«^ 



Fig. 149. — Pandorina Morum. A, non-sexual colony (or ccenobium) of 16 zoogoni- 

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

 cilia are attached. 



B^ sixteen young pexual colonies about to leave the gflatinoiie wall. 



Cand Z), colonies of sexual zoospores escaping. 



M^ F, G, conjugating zoospores 



-ff", zygospore in resting etage (red). 



J, Ky germinating zygospore, the contents escaping as a large red ciliated ewarm- 

 epore. 



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



JW, the same colony as X, in a further stage of development.— After (Ereted. 



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- 



