MARINE ALGAL VEGETATION 53 



Table 1. The Distribution of the Species along the coast (continued). 



Cyanophyceae. 



B 2 Pleurocapsa amethystea c. . 



D Plectonema norvegicum (c) 



E Phormidium autumnale (c) 



C Spirulina subsalsa (c) . 



C Calothrix scopulorum (c) . . 



C Rivularia atra (c) 



E. Icel. 



N. Icel. 



NW.Icel. 



SW.Icel. 



S. Icel. 



+ 



+ 

 + 



+ 



+ 



+ 



+ 



+ 





+ 





+ 



+ 





+ 





From Iceland (31, 14 and 57) there are published 76 species of 

 red algae, 67 species of brown, 51 of green and 6 af blue-green — 

 200 species in all. All of these, of course, are not equally common 

 along the coast, and their habitats, as far as these are known, in 

 the five districts into which the coast is divided, are given in the 

 above table. That table shows that comparatively few species occur 

 in all the coastal districts (in the table, such are indicated by the 

 letter c placed after the name of the species). In all parts of the 

 coast are found 15 species (20 %) of red algae, 18 species (26.8 %) 

 of brown, 10 species (19.6%) of green and 1 species (16.6%) of 

 blue-green. Thus, of the 200 species there are 44 species (22 %) 

 which are common to all the coastal districts. 



If we take into consideration the fact that the great stretch of 

 coast round the whole of Iceland is as yet far from accurately investi- 

 gated, we may expect, after future investigations, not only that several 

 more species will be found, but also that the distribution of the 

 species in the different parts of the coast will prove to differ from 

 what is at present stated to be the case. Therefore, in the above 

 list of the distribution of the species along the coast I have placed 

 a (c) after the name of those species which, as I surmise, are pro- 

 bably to be found in all parts of the coast. I base this supposition 

 partly on the position of the habitats already known along the 

 coast, and partly on the occurrence of the species in the adjacent 

 floral districts, e. g. the Faeroes and Greenland. 



The mark (c) is subjoined to 14 species of red algae, 29 species 

 of brown, 32 species of green and to 5 species of blue-green. On 

 adding to this the above-mentioned species which have the letter c 

 subjoined we get 29 species (38 %) of red algae, 47 species (70 %) 

 of brown, 42 species (82%) of green and 6 species (100%) of blue- 

 green. Thus, of the 200 species 124 prove to be common to all parts 





