THE DISTRIBUTION OF THE MARINE ALGÆ OF THE 



ARCTIC SEA AND OF THE NORTHERNMOST PART OF 



THE ATLANTIC 



BY 



F. BORGESEN and HELGI JONSSON. 



WE have jointly composed tlie following paper on the distribu- 

 tion of the Marine Algæ of the Arctic Sea and of the nor- 

 thernmost part of the Atlantic for the purpose of comparing the 

 Færoese and the Icelandic Marine Algæ-flora with that of the neigh- 

 bouring coast. 



Besides the Algæ of the Arctic Sea we have included those spe- 

 cies from along the coasts of Europe which occur in the North 

 Atlantic to the north of a line drawn from Lindesnæs in Norway 

 to the boundary between England and Scotland, and from the 

 American coasts of the Atlantic those from the coasts of New 

 England mentioned by Farlow (16) and Collins (12). The south 

 limit we have chosen is not a distinctly phytogeographical one, but 

 we have chosen it because it is apparently quite unnecessary to in- 

 clude a larger area for the purpose of investigating, how far the 

 Marine Algæ-flora of the Færoes and Iceland agree with that of 

 the neighbouring coasts. 



The faet that the Algæ of the different countries have in many 

 respects been differently treated, makes it very difficult to draw 

 up a list like the one in question. But, as may be seen in our 

 foot-notes, we have, as far as possible, tried to overcome these dif- 

 ficulties and to clear up several doubtful species. 



Regarding the books most used we refer to the following list 

 of Literature. 



Our best thanks are due to Mr. M. Foslie of Trondhjem for a 

 revised list of the calcareous Algæ of the area in question and for 

 many important informations on Norwegian Algæ, and to Mr. E. 

 Norum of Haugesund for sending us an unpublished list of the 

 Phæophyceæ from the environs of Haugesund. Above all we are 

 highly indebted to Dr. L. Kolderup Rosenvinge for much valuable 

 information. 



Botany of the Fieroes. Appendix. 1 



