ZTGNEMAGM^. 



233 



similar processes from parallel filaments {a, I, Fig. 156). 

 Upon meeting, the ends of the processes flatten upon each 

 other, the walls fuse together, and soon afterward become 

 absorbed, thus making a channel leading from one cell 

 to the other (Fig. 157). Through this channel the proto- 



FlQ. 156. 



Fi" 156. — Beginning of the process of conjugation m Spirogyra longata. a. 

 beginning of the formation of lateral tubes ; 6, e, the tubes in contact. X 530. 



A ft Pr WflChS 



Fig 157 —Conjugation of Spirogyra longatn. A. the protoplasm passing from 

 one cell to the other at a ; i, the mass of protoplasm formed by the union of the 

 protoplasmic contents of the two cells. „ „, 



B two vouno- zygospores (c), each with a cell-wall. They contain numerous oil 

 drops, and are still enclosed by the walls of the parent cell. X 650.— Alter Sachs. 



plasm of one cell passes into the other, and the two fuse into 

 one mass, which becomes rounded, and in a short time secretes 

 a wall of cellulose around itself (Fig. 157, ^ and B). The 

 zygospore thus formed is set free by the decay of the dead 



