HOW TO KNOW THE SEAWEEDS 



176a Cystocarps coronate (Fig. 221 A); blades subdichotomous and of 



more or less irregular palmate-ilabellate outline. Fig. 221 



Fauchea 



Fig. 221. Fauchea laciniata 

 Agardh 



J. 



A. A single coronate cystocarp, 

 X 12. B. A small, upper portion 

 of a large (15 cm.) cystocarpic plant 

 with relatively narrow blade-seg- 

 ments, X 0.8. This species may be 

 encountered frequently at lowest 

 intertidal levels in central and 

 southern California. Plants are of- 

 ten only 5 to 6 cm. wide or high 

 and broadly flabellate. We have 

 only one other species, F. fryeana 

 Setchell, in infratidal waters of 

 Puget Sound. 



Figure 221 



I76b Cystocarps not coronate (See Fig. 220); blades subsimple to sub- 

 dichotomous or regularly dichotomous. Figs. 218, 222 . Hhodymenia 



Fig. 222. Rhodymenia pad- 

 iica Kylin 



Part of a plant showing 

 dichotomous branching and 

 the production of stolons at 

 the base, X 0.72. This spe- 

 cies and several others of 

 dichotomous form and simi- 

 lar habit occur frequently 

 along the coast of California 

 and southern Oregon. In ad- 

 dition to these there are sev- 

 eral species with relatively 

 broad blades and somewhat 

 simpler branching habit. R. 

 palmata (Linnaeus) Greville is 

 a broad-bladed plant which is 

 subsimple below and dichotomous or palmately divided above. It oc- 

 curs along the New England coast as well as in the Puget Sound 

 region of Washington. This is the food-seaweed known as "dulse" 



Figure 222 



166 



