28 



REPRODUCTION 



Na- 



the 



A 



Figures. Uloihrix, one of the filamentous algae. 

 The figure at the right shows the production of both 

 spores and gametes by the same individual. From 

 Coulter's Plant Life and Plant Uses. 



Spores such 

 as are de- 

 scribed above 

 are found in 

 many of the 

 algae and 

 fungi. 



2. The 

 ture of 

 Spore. 



spore differs 

 from the small 

 dded daugh- 

 ter cells of the 

 yeast, for ex- 

 ample, in this: 

 the spore is 

 merely a re- 

 productive cell. 

 It does not 

 look like the 



plant from v^hich it came. Furthermore it takes no 

 part in getting its own nutrition, as the yeast bud 

 does. It is nourished by the parent until it is ripe. 

 The yeast bud looks like its parent plant from the 

 beginning, only smaller. Whether spores are formed 

 internally, as described above, or externally, somewhat as 

 yeast buds are formed, they are always just single cells 

 with the power to develop into a plant like the mother. 

 They are not small editions of the plant itself. 



3. What of the Original Cell? In the forming of spores 

 the old parental wall is left behind, and sometimes there 

 may be fragments of the old protoplasm that did not 

 enter into any of the spores. These things represent what 

 is left of the parent cell. There is not enough vitality in 

 these remnants to enable the mother cell to continue its 



