GLOSSARY AND INDEX 



119 



Vaucheria, gametes of, 22. 



Vegetative increase of number by 

 separation of a part (bud), or 

 a single cell from the parent, 

 without syngamy : in Ulo- 

 thrix, 13. 



Yolk, 72. 



Zamia, spermatozoids of, 47. 



Zoo-spores, or swarm-spores, naked 

 cells capable of movement in 

 water, which reproduce the 

 plant vegetatively : of Ulo- 

 thrix, 13. 



Zygote, the result of fusion of 

 sexual cells or gametes : it is 

 the starting point of a new in- 

 dividual, 3 : of Ectocarpus, 16 : 

 of Copromonas, 57 : resting 

 stage, 61 : of Stylorhynchus , 58. 



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