78 SEA MOSSES. 



The full grown plant must be two or three feet long, 

 though my specimens do not show it. It is olive green 

 when fresh, but like most of the Fucacece turns black 

 in drying. 



Genus.— FUCUS* L. 



The plants of this genus are together popularly 

 known as " Rockweed." They constitute, on the 

 Atlantic coast at least, more than one-half of the mass 

 of our littoral Algae. There are three species sufficiently 

 common on the Atlantic coast to come within the 

 scope of this book, and one on the Pacific. The 

 latter will be described first, it standing thus in the 

 natural order. 



FUCUS FASTIGATUS, AG. 



This species seems to be the most common Funis 

 in southern California, though F. vesiculosus grows 

 there in abundance, as it does also along the coast 

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

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

 terey. Mr. Cleveland says that F. fastigiatus grows 

 at San Diego in mats, on flat rocks left uncovered 

 by the ebb tide, at all seasons, abundant. 



* Fucus = Seaweed. 



