HOW TO KNOW THE SEAWEEDS 



151a Surface and margins of blade covered with small, wart-like or 

 tooth-like papil. Fig. 190 Gigartma (in part) 



Fig, 190. Gigartina harveyana 

 (Kiitzing) Setchell & Gardner 



Figure 190 



A maturing cystocarpic plant, 

 X 0.8. This is a common one of 

 several simple, flat, ligulate to 

 broadly complanate species of this 

 genus on the Pacific Coast. It oc- 

 curs in California and Oregon. 

 One or more species of this gen- 

 eral form may be expected to oc- 

 cur at low levels on most any ex- 

 posed, rocky shore along the Pa- 

 cific. Many of the best specimens 

 may be found in drift where their 

 large, conspicuous, reddish blades 

 are sure to attract attention. The 

 characteristic wart-like outgrowths 

 on the blade surfaces provide for 

 an easy means of identification so 

 that the student of Pacific sea- 

 weeds quickly becomes familiar 

 with the broad forms of this genus. 

 There are other members of Gigar- 

 tina, however, of very different 

 form, and it is these smaller, much 

 branched subcyhndrical or com- 

 pressed species which usually puz- 

 zle the beginner. Some important 

 examples of these other forms of 

 Gigartina are treated under steps 

 168a and 187a. 



147 



