106 KJELLMAN, THE ALGAH OF THE ARCTIC SEA. 
Syn. Atomaria dentata Rupr. Alg. Och. p. 209. 
» Fucus dentatus Gunn. Fl. Norv. 2, p. 91. 
» Odonthalia dentata J. G. Ag. Spetsb. Alg. Progr. p. 3, Bidr. p. 11; Till. p. 28. 
» » » Arescu. Phye. Scand. p. 261. 
» » » Dickie, Alg. Cumberl. p. 238. 
» » » Eaton, List. Dp: 44. 
» Ds » Gost, Algenfl. Weiss. Meer. p. 23. 
» » » Harv. Fl. West-Eskim. p. 49. 
» » » KJELLM. Spetsb. Thall. 1, p. 5; Algenv. Murm. Meer. p. 9; Kariska hafvets 
Algv. p. 19. 
» » » KLEEN, Nordl. Alg. p. 12. 
» » » Ny. et Sau. Herb. Fenn. p. 73. 
» » » Post et Rupr. Ill. Alg. p. II. 
» Rhodomela dentata Linpsx. Bot. Not. p. 157. 
» » » ScuHrenk, Ural. Reise 2, p. 547. 
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 ean 
be drawn between them. 
Habitat. The present species always grows within the sublitoral zone. In the 
Norwegian Polar Sea it has been found by Kenn 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 alge within 
the formation I have above called the arctic. Within the arctic region of the Polar 
Sea it belongs chiefly to the formation of Laminariacew. 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. Ruprecut 
mentions having collected such specimens in the month of June at Triostrowa (Rupr. 
Ale. 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 Gjesver 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 Maasé, Gjesver, Talvik; Vardd (GuNNERUS). 
The Greenland Sea: scarce and local along the west and north coasts of Spitz- 
bergen; Beeren Eiland. 
