HOW TO KNOW THE SEAWEEDS 



109a Thallus distinctly segmented 1 10 



109b Thcdlus not segmented 1 17 



110a Each growing apex bearing a tuft of branched filaments. Fig. 146. 

 CymopoUa barbaia 



Fig. 146. Cymopolia barbata (Linnaeus) Lam- 

 ouroux 



A small upper portion of a plant to show 

 the segmented character and terminal tufts 

 of hairs, X 2. A common plant of shallow 

 water in southern Florida. 



Figure 146 



1 10b Apices without tufts of filaments HI 



Ilia Base of plant with a fibrous holdfast which penetrates sand or 

 mud. Fig. 147 Halimeda 



Fig. 147. Halimeda discoidea De- 

 caisne 



A small plant showing the calci- 

 fied segments separated by fibrous, 

 flexible joints, and the fibrous hold- 

 fast, X 0.75. This is one of several 

 species, all of cactus-Uke form, which 

 .may be encountered in southern 

 Florida. 



Figure 147 



113 



