2 3 Marine Algal (Communities of the Juan Fernandez Is- 

 lands, with remarks on the (Composition of the Flora. 



By 



C. SKOTTSBERG. 



With Plate 54. 



During m}- two visits to Juan F'ernandez observations were made on the 

 tnode of occurrence and composition of tiie various communities of marine algae. 

 A publication had to be postponed until the species had been determined; for 

 authors' names, descriptions and figures, see Dr. T. Levring's paper (this volurne, 

 no. 22). Unfortunately, the Corallhiaceac of 191 7, which were handed over to 

 Mine Paul Lemoine of Paris, could not be included. They contain several crust- 

 aceous and fruticulose forms, but it is impossible to tell when their names will 

 become available. The 1908 collection included, besides one or two Corallhiac, 

 two species of LitJiophyllum, L. fernaiidcziaiiuni Lem. and L. spec, possibly 

 identical with Mclobcsia pustulata Lam. in Dickie's paper (see Lemoine in K. 

 Svenska Vetenskapsakademiens Handl., Bd 61:4, 1920). DiCKlE listed Corallina 

 subulata Ell. and C. Bertcrii Mont. (.-= C. Bertcroana Mont, ex Harvey, Xer. 

 austr. II, p. 103; Chile, Bertero). I think that the same species are in m}- 

 collection, but I cannot tell if Dickie's determinations are correct. 



Seaweed collecting along the shores of the Juan Fernandez Islands is no 

 easy task. Most of the coast of Masatierra is constantly fringed by breakers, the 

 south shore being exposed to very strong surf because the prevailing wind 

 direction is SW — SE. Here landing is possible in Carbajal bay, at least in 

 calm weather. The greater part of the shore is inaccessible from land. The 

 only place where I was able to collect littoral algae was a small terrace with 

 tidepools at the foot of Cerro Negro. The north coast is decidedly less difficult. 

 There are several bays or coves which can be visited from land or sea, from 

 west to east Bahia del Padre, Juanango, La Vaqueria, Puerto Ingles, Bahia 

 Cumberland and Puerto Frances. I found the best collecting grounds in Padre 

 bay, where the tidal region is wide and exhibits a very marked zonation, and 

 in Puerto Ingles at the landing place where, however, the swell has to be 

 watched closely. As a rule the coast is very steep,, so that the littoral region 



