104 



CHLOROPHYCEAE 



H 



D 

 C 



B 



Fig. 70. Mougeotia. A-E, M. ynirabilis, stages in conjugation through loss of 

 cell wall. F, normal conjugation in M. mirabilis. n = new walls cutting off zygote. 

 Gr-I, stages in lateral conjugation of M. oedogonioides. J, two azygotes in 

 M. mirabilis. (A-F, after Czurda; G-I, after Fritsch; J, after Kniep.) 



pM^ms^f^ 



Fig. 71. Mesotaenium. A, plant of M. De Greyi. B-E, conjugation of Cylindro- 

 cystis Brebissonii and germination of zygospore. (After Fritsch.) 



