258 KJELLMAN, THE ALGiE OF THE ARCTIC SEA. 



Remark on the definition of the forms. The algse naraed by J. G. Agardh Lami- 

 naria fascia and L. cwsjntosa, although very different in their typical forms, are yet 

 connected with each other by transitions so that it is impossible to draw any distinct 

 limit between them. In the Polar Sea f. ccesintosa predominates, and at certain places, 

 for instance, at Finmarken on exposed coasts, becomes very large-sized. At Gjesvajr 

 individuals of half a metre in length and 3 — 4,r> cm. in breadth were common. In the 

 interiör of Altenfjord the plant was smaller and narrower, possessing nearly the same 

 aspect as the broader of the two forms distributed in Alg. Scand. exsicc. under N:o 

 96. The same form exists at Greenland. Farther southwards on the coast of Norway, 

 at Nordlanden, it becomes still narrower, assuming the appearance of the typical form. 

 However, it occurs hei-e also in forms that are intermediate between the typical one 

 and f. ccBspitosa. 



Habitat. The present species belongs to the lower part of the litoral zone. It is 

 usnally attached to stones and occurs in the most exposed localities as well as in the 

 interiör of deep bays, generally growing in large masses so as to determine essentially 

 the character of the vegetation. I have found specimens with zoosporangia at Fin- 

 marken at the beginning of August and I have seen such specimens from Greenland, 

 which were probably collected at the end of September or the commencement of October. 



Geogr. Distrib. This species goes north of the 78:th latitude on the west coast 

 of Greenland, in case the alga determined by Ashmead as Laminaria fascia is really 

 identical with the present one. In the eastern hemisphere it hardly penetrates into the 

 Arctic Sea proper. For it is known neither from the Greenland Sea, nor from the 

 eastern Murman Sea, nor from the Siberian Sea. Its northernmost point here is Gjes- 

 v«r about Lat. N. 71°. In certain localities of Finmarken it was abundant. 



Localities: The Norioegian Polar Sea: Nordlanden (f. typica and transitions to f. 

 ccespitosa) common and abundant; Finmarken (f. ccespitosa): Gjesvser local but abundant, 

 Talvik local and rather scarce. 



The Murman Sea: the coast of Russian Lapland. 



The White Sea: Solowetzki Isles. 



The American Arctic Sea: Union Bay. 



Baffin Bay: Cumberland Sound, the west coast of Greenland at Julianeshaab, 

 Godthaab, Sukkertoppen, Hunde Islands, and between the 78: th and 82:d latitude. 



Gen. Scytosiphon (Ag.) Thur. 



in Le Jol. Liste Alg. Cherb. p. 20; Ag. Spec. Alg. 1, p. 160; char. mut. 



Scytosiphon lomentarius (Lyngb.) J. G. Ag. 



Spec. Alg. 1, p. 126. Chorda lomentaria Lyngb. Hydr. Dan. p. 74. 



Descr. Scytosiphon lomentarius J. G, Ag. 1. c. 



Fig. Chorda lomentaria Harv. Phyc. Brit. t. 285. 



Exsicc. Chorda lomentaria Aresch. Als;. Scand. exsicc. N:o 94. 



