106 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



6'yn. Atomaria dentata Rupr. Alg. Och. p. 209. 



» Fucus dentatus Guxn. F1. Norv. 2, p. 91. 



>• OdoQthalia dentata J. G. Ag. Spetsb. Alg. Progr. p. 3, Bidr. p. 11; Till. p. 28. 

 » >> » Aeesch. Phyc. Scand. p. 261. 



" » » Dickie, Alg. Cumber), p. 238. 



» » » Eaton, List. p. 44. 



» » » Gobi, Algenfl. Weiss. Meer. p. 23. 



» » » Hart. F1. West-Eskim. p. 49. 



» » B Kjellm. Spetsb. Thall. 1, p. 5; Algenv. Murra. Meer. p. 9; Kariska hafvets 



Algv. p. 19. 

 » " » Kleen, Nordl. Alg. p. 12. 



" » I) Nyl. et S^L. Herb. Fenn. p. 73. 



i> » » Post et Edpr. 111. Alg. p. II. 



» Ehodomela dentata Lindbl. Bot. Not. p. 157. 

 » » » ScHRENK, Ural. Eeise 2, p. 647. 



Remark on the forms of the species. Two forms have been distinguished, one with 

 broader, the other with narrower frond, the latter one named f. angusta by Harvey 

 (Fl. West-Eskim.). They pass however so gradually into each other, that no limit can 

 be drawn between them. 



Habitat. The present species always grows within the sublitoral zone. In the 

 Norwegian Polar Sea it has been found by Kleen on deep stony and shelly bottom. 

 I have taken it here myself sometimes luxuriantly developed on gravelly bottom in 10 

 — 15 fathoms water, sometimes poorly developed on so-called dead bottom at a depth 

 of 5 — 6 fathoms, in the former case together with several purely arctic algae within 

 the formation I have above called the arctic. Within the arctic region of the Polar 

 Sea it belongs chiefly to the formation of Laminariacece. It is properly a pelagic species, 

 but is nevertheless to be found also in the interior of deep bays, although it is more 

 rare and less richly developed here. Almost without exception it grows scattered. On 

 the west coast of Sweden and the coasts of Great Britain it bears spores in winter. 

 In the Polar Sea I have not met with any specimens with reproductive organs during 

 that time, but I have found individuals with tetraspores in summer, in August. Rupkecht 

 mentions having collected such specimens in the month of June at Triostrowa (Rupr. 

 Alg. Och. p. 212). In some specimens taken at Finmarken in the interior of Altenfjord 

 at the end of August, there are to be seen the beginnings of sporocarps. Hence it 

 seems as if the present species should develop its organs of propagation at another 

 season in the Polar Sea than farther to the south. 



Geogr. Distrib. The plant is circumpolar. I have found it most common and 

 luxuriant at Gjesvajr in the Norwegian Polar Sea and in the eastern part of the Mur- 

 man Sea. Its northernmost locality is Treurenberg Bay on the north coast of Spitz- 

 bergen 79° 56' N. Lat. 



Localities: The Norwegian Polar Sea: Nordlanden, scanty, local; Finmarken at 

 several places, but local and not plentiful, as at Maaso, Gjesvser, Talvik ; Vardo (Gunnerus). 



The Greenland Sea: scarce and local along the west and north coasts of Spitz- 

 bergen; Beeren Eiland. 



