270 KJELLMAN, THE ALG-ffi OF THE ARCTIC SEA. 



Syn. Scytosiphon foeniculaceus Lyxgb. Hydr. Dan. p. 63; ex parte. 

 » » Nyl. et Ssel. p. 73. 



» » Post, et Edpe. 111. Alg. p. II. 



Habitat. This species is literal in the Norwegian Polar Sea, epiphytic on Fucacece, 

 sublitoral in other parts of the Arctic Sea, chiefly attached to Chordaria fiagelliformis 

 or stones. It grows rather scattered both on exposed and on sheltered coasts. On 

 the north coast of Spitzbergen there occurred through the whole winter an intermediate 

 form between the typical one and f. flaccida. It retained its characteristic appearance 

 and was in development all the time. At Nordlanden it bears zoosporangia during the 

 summer, at Finmarken in August and September, at Spitzbergen in July and August, 

 on the west coast of Novaya Zemlya in July. 



Geogr. Distrib. Known from the Polar Sea north of the Atlantic. The maximum 

 of frequency is on the north coast of Norway. The most northerly point where it has 

 been found is Rawlingsbay in Smith Sound Lat. N. 80° 20'. 



Localities: The Norwegian Polar Sea: Nordlanden, common and abundant; Fin- 

 marken, common and abundant: Magero Sound, Maas5, Gjesvser, Oxfjord, and Talvik. 



The Greenland Sea: the north and west coasts of Spitzbergen rather common, but 

 not abundant. 



The Murman Sea: the coast of Russian Lapland, the west coast of Novaya Zemlya 

 local, but rather plentiful. 



The White Sea: probably common and plentiful (cp. Gobi 1. c. p. 11). 



Baffin Bay: Cumberland Sound not rare; the west coast of Greenland at Tessar- 

 miut, Lichtenau, Neuherrnhut, Godthaab, Holstenborg, Egedesminde, Hunde Islands, 

 Jakobshavn, Claushavn, Disco Isle, Rittenbenk, Sakkak, Rawlingsbay, probably commonly 

 disseminated along the whole coast (cp. Croall 1. c). 



Both the mentioned forms have the same extent of distribution, but according 

 to my experience f. flaccida and forms most closely related with it are the most common 

 in the North. 



Dictyosiphon hispidus Kjellm. 



Algenv. Murm. ileer. p. 47. 

 Descr. et Fig. Dictyosiphon foeniculaceus subspec. hispidus Kjellm. Spetsb. Thall. 2, p. 39 et t. 2, fig. 1. 

 Syn. Enteromorpha ramulosa Zelleh, Zweite d. Polarf. p. 84; sec. spec. 



Remark on the sjjecies. Gobi supposes this alga to be ?i D. foeniculaceus i. flaccida 

 somewhat more richly branching. It certainly reminds one of f. flaccida by its soft, 

 flexible, very tubulose frond, but it differs from it parth- by smaller zoosporangia, 

 partly by its peculiar branching. In the case of a genus with so feebly marked forms 

 as Dictyosiphon it must however in a certain degree be arbitrary whether a given form 

 should be considered a variety or a species. The chief reason why I think it is more 

 differentiated than f. flaccida and other forms of Dictyosiphon is the fact that it is found 

 with its characteristic habit in widely distant parts of the Arctic Sea. 



