ALGAE OF THE CHILEAN SEAS 247 



of view, have been published. Also the station has already assembled 

 a well stocked collection including specimens from the Chilean main- 

 land, its islands, and the Antarctic, as well as from various regions of 

 other continents. 



The region from Arica to Cape Horn is a very rich one, both 

 in genera and species. There is a littoral rocky zone, beaten by the 

 constant and strong wave impact, with deep and shallow pools, and a 

 sublittoral zone where the rocks are cliff-like and covered by a veritable 

 belt of large-sized algae. 



The author does not attempt to make a systematic list of all the 

 species, but will only refer to the most characteristic of the benthic Chlo- 

 rophyceae, Phaeophyceae, and Rhodophyceae of the continental shelf. 



Among the species so far identified, some are cosmopolitan, and, in 

 the northern zone, there are elements common to the Peruvian flora. 

 The islands are characterized by their endemicity. Some of the large 

 Phaeophyceae species are also found in the waters off South Africa and 

 New Zealand. 



A. In the littoral zone we distinguish: 



1. An upper littoral belt, characterized by algae resistant both to 

 desiccation and to changes in salinity, particularly in the pools. 



MYXOPHYCEAE 



NOSTOCOCALES 

 Lyngbya confervoides C. A. Ag., on the rocks of the upper littoral 

 belt. 



CHLOROPHYCEAE 



ULOTRICALES 

 Enteromorpha bulhosa (Suhr.) Kiitz. 

 E. compressa (L.) Grev. 

 E. intestinalis (L.) Link. 

 E. Lima (L.) J. Ag. 



Ulva lactuca (L.) v. rigida (Ag.) Le Jolis. 

 U. V. latissima D. C. 



CLADOPHORALES 

 Chaetomorpha linum (Miiller) Kiitz. 

 Ch. aerea (Dilwyn) 

 Cladophora pacifica (Mont.) Kiitz. 

 C. incompta Hook. f. et Harv. 

 C. sub simplex Kiitz. 

 Spongomorpha arcta (Dilw.) Kiitz. 



