SUPPLEMENT 



instance, have a higher method of reproduction. Within the concep- 

 tacles, visible as dots to the unaided eye, are antheridia containing 

 minute fertilizing or sperm cells, and oogonia containing much larger 

 egg cells. A sperm cell and an egg cell unite to form a strong spore. 

 Red Algae have also a higher form of reproduction, As the result of 

 the union of two unlike cells there grow spore fruits. These spore 

 fruits are conspicuous on the Gigartinas, and are frequently found on 

 other red Algae. The growth of new Algae from fragments is men- 

 tioned in the Reader. 



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