KONGL. SV. VET. AKADKMIENS HANDLINGAR. BAND. 20. N:0 5. 157 



Halosaccion saccatum (Lepech.) 



Fuous saccatus Lepech. Comment. Petrdp, p. 478. 

 Descr. Fucus saccatus Lepech. 1. c. 

 Fig. >< » » tab. 21. 



Remark on the species. There is no doubt but that Lepechin's Fucus saccatus is 

 a species of Halosaccion, resembling those species of this genus which are to be found 

 in the northern part of the Pacific. The occurrence of such a species on the arctic 

 coast is not at all impossible and the statement about the locality seems to be reliable. 

 Accordingly this species ought to be recorded now, I think, in the Flora of the 

 Arctic Sea. 



Habitat. Lepechin says: ad instar gloraerum integros investit lapides. 



Geogr. Distrib. and Locality. It is reported by Lepechin from the Tri-Ostrowa 

 Islands in the White Sea. 



Gen. Dumontia (Lamour.) J. G. Ag. 



Spec. Alg. 2, p. 348, Lamour. Ess. p. 133; char. mut. 



Dumontia filiformis (Fl. Dan.) Grev. 

 A.le;. Brit. p. 165. Ulva filiformis Fl. Dan. t. 1480. 

 Descr. Dumontia filiformis J. G. Ag. Epicr. p. 257. 

 Fig. » » KiJTZ. Tab. Phyc. 16, t. 81. 



Exsicc. » » Aresch. Alg. Scanrl. exsicc. N:o 79 et 157. 



Syn. Dumontia contorta Eupu. Alg. Och. p. 295. 



» filiformis Akesch, Phyc. Scand. p. 312. 



» Croall, Fl. Disc. p. 459. 



» Gobi, Algenfl. Weiss. Meer. p. 37. 



» Nyl. et Sfel. Herb. Mus. Fenn. p. 74. 



Ulva filiformis Sommerf. Suppl. p. 187. 

 » » Wg. Fl. Lapp. p. 508. 



Habitat. This is a litoral alga, usually occurring in rock-pools between tides. 

 It prefers sheltered places and is generally found somewhat gregarious. Kleen has 

 found it with sporocarps and tetrasporangia in the southern part of the Norwegian 

 Polar Sea in the month of June. 



Geogr. Distrib. It belongs to the Atlantic as well as the arctic region of the 

 Polar Sea, but is not much spread in the latter. Its maximum of frequency is in the 

 most southerly parts of the Polar Sea. I did not see it anywhere at Finmarken, but 

 this may possibly have been caused by my investigations being carried on there too 

 late in the year. For it is not unlikely that the development of this alga, here as well 

 farther southwards, is finished within the earlier part of the year. It has been found 

 here by Wahlenberg in Altenfjord, which is the northernmost known locality of the 

 species. 



