[3] 72 ALGrJE 



Spirogyra (continued). 



E. Conjugating cells of Spirogyra filaments. Examine the slides of red-stained material provided and select 

 examples, from which to draw (a) the lateral protuberances of cells in an early stage of conjugation, (b) meeting 

 of protuberances, (c) passage of protoplasm through conjugation canal, (d) young zygote, (e) older zygote with 

 thick wall. Draw as many distinct stages as you can distinguish. 



(N.B. In some forms of Spirogyra conjugation takes place between adjacent cells of the same filament.) 



' I 



C=i 



rH 



