III. THE HORIZONTAL DISTRIBUTION OF THE 

 SPECIES AND THE COMPONENTS OF THE 



ALGAL FLORA. 



IN the following list (Table I) of the hitherto known Marine Algae 

 of Iceland a letter (A, B 1? B 2 , C, D, E 17 E 2 ) is placed before 

 each species, showing to which plant-geographical group I refer it 

 (cf. Borgesen and Joiisson, 14). A indicates the arctic group, 

 B! sub-division 1 of the subarctic group, B 2 sub-division 2 of the 

 subarctic group, C the boreal-arctic group, D the cold-boreal group 

 and E the warm-boreal group. The letter c placed after the name 

 of the species indicates that it has been found in all the five 

 coastal districts (E. Icel., N. Icel., NW. Icel., SW. Icel. and S. IceL, 

 see above, p. 5); a (c) placed after the name of the species indi- 

 cates that it probably occurs in all parts of the coast. 



Table 1. The Distribution of the Species along the coast. 



