352 



Conjugate 



of conjugation, since he states that in the conjugation of binucleated cells parthenospores 

 were sometimes formed. 



Fig. 218. A, Spirogyra nitida (Dillw.) Link, showing scalariform conjugation between six 

 filaments, x 75. 1?, Sp. setiformis (Both) Kutz., showing frustrated attempts at conjugation 

 between two male cells and one female cell, x 90. C, Sp. Spreeiana Babenh. , x 390. D, Sp. 

 inftata (Vauch.) Babenh., lateral conjugation, x 390. E and F, zygospores of Sp. velata 

 Nordst. germinating immediately after their formation and before the differentiation of the 

 wall of the zygospore, x 165. G, germination of zygospore of Sp. velata after normal period 

 of rest, x230. 



Klebs found that still water and bright illumination were favourable to 

 conjugation, whereas running water and an excess of available food-materials 



