THE GKEEN ALGvE (CPILOROPHYCE^) 211 



more delicate than the brown forms.^ There are often many 

 branches, the smallest ones becoming quite thread-like, so 

 that the entire plant looks to the beginning student like a 

 sparsely branched stem Avith many finely divided leaves. In 

 their asexual reproduction the red algse may form spores in 

 groups of four (Fig. 175). 



Fig. 174. A red alga (Dasya) 



1 The best way for the teacher to give a general notion of brown and red 

 algae is to secure card mounts or bottled material for class demonstrations 

 of a few of the leading types in each group. These may be obtained from 

 the Woods Hole Biological Laboratory, Woods Hole, Massachusetts, and 

 from other reliable supply houses. Well-prepared card mounts preserve the 

 natural colors, and may be kept indefinitely for laboratory use. 



