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to Langanes (Jönsson 1910). The cold polar current, which passes 

 along these coasts, seems to extinguish every CeramiumAiïe. 



In West-Greenland and on the northern coast of Iceland the con- 

 ditions for Ceramium-life still are tolerably good. In the first named 

 area 3 species, in North-Iceland but 2 species are found, in both places 

 in extremely small number. On the coasts of NW., W., SW. and 

 S. Iceland the conditions for Ceramium life are more favorable as 

 7 species are met with here. Still the number of individuals seems 

 to be small and their development often inconsiderable. In con- 

 tradistinction to this comparatively high number of species only 4 

 species are thriving on the coasts of the Færoes. The cause of 

 this fact is probably due 1 ) to the inconsiderable size of these is- 

 lands, these species thriving particularly well here under good 

 conditions. 



The three areas are characterized by the poorness of species 

 with sharply confined zones. In West-Greenland such species are 

 not met with. On the coasts of Iceland and the Færoes it is only 

 C. acanthonotum which is of consequence, C. Deslongchampii being 

 only observed once in Reykjavik in Iceland. It is curious that 

 C. Deslongchampii which is indicated by Fos lie and Kjell m an 

 from Nordland and Finmarken and which is common south is not 

 occurring at the Færoes. Of C. tenuissimum, diaphanum and strictum 

 no traces are found in the herbaria. When Kleen (1874) indicates 

 to have found C. diaphanum between 67°.8 and 68°.4 north latitude 

 on the coast of Norway it is probably due to a misunderstanding 

 of this species. 



Species with typical upward growing zones are not much re- 

 presented in the areas in question. From Iceland lie before us 

 from a single locality doubtful specimens of C. fruticulosum . On 

 the coast of West-Greenland C. Areschougii has been found. This 

 occurrence is peculiar, the species being common in the Danish 

 and Swedish waters and not being obtained from the Færoes and 

 Iceland. Possibly we have here to do with an occurrence due to the 

 navigation. Yet it must be put in mind together with this that a 

 form closely related to C. Areschougii is found on the coast of 

 Spetsbergen (Kjellmans collections: G.arcticum Agardh?). Related 

 to this group or intermediate between this and the group of C. 

 Rosenvingii-arborescens two new species are found : C. Boergesenii 



*) Dr. Kolderup Rosenvinge has called my attention to this fact. 



