78 SEA .\fOSSRS. 



The full grown phnt must be two or three feci lo?»". 

 though my siHrrimcns do not show it. It is oHvc gici ii 

 when frc>»h, but like most of the Futacea turns bLirk 

 in drying. 



Genus.— /reus* L, 



The plants of this genus arc together ix)pulirly 

 known as " Ro< kweed." 'ITicy constitute, on the 

 Atbntic coA-st at least, more tlun one-half of the i: 

 of our liit«)r.il Algx. 'lliere are three s|)eci< 

 common on the Aibntic coast to com m tlie 



scope of this Inx^k, and one on the Pacific. 'Hie 

 latter will Ik: descnlnrd first, it standing thus in the 

 natural order. 



FuCfS FASTIGATUS, AC. 



This species seems to l>e the most common Fucus 

 in southern California, though /•'. jrsicu/osus grows 

 there in abundance, as it docs also along the < 

 north ; and F. Harwyanus is found as a rare plant 

 at Santa Bartxira, and as a common one at Mon- 

 terey. Mr. Clevehnd says that F. fasti flatus grows 

 at San Diego in noats, on flat ro<ks left uncovered 

 by the ebb tide, at all seasons, abundant. 



* Kucm n Scswccd. 



