KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. wN:0 5. 157 
Halosaccion saccatum (Lerecn.) 
Fucus saccatus Lerncu. Comment. Petrop, p. 478. 
Descr. Fueus saceatus Lerecn. |. c. 
rig. » » » tab. 21. 
Remark on the species. There is no doubt but that Lepecuiy’s Pucus 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. Lrprecuin says: ad instar glomerum integros investit lapides. 
Geogr. Distrib. and Locality. It is reported by Lerecuin from the Tri-Ostrowa 
Islands in the White Sea. 
Gen. Dumontia (Lamour.) J. G. Aa. 
Spec. Alg. 2, p. 348, Lamour. Ess. p. 133; char. mut. 
Dumontia filiformis (Fl. Dan.) Grev. 
Alg. Brit. p. 165. Ulva filiformis Fl. Dan. t. 1480. 
Descr. Dumontia filiformis J. G. Ac. Epier. p. 257. 
Fig. » » KurzeTab: Phye:) 16, -t: Si. 
Exsice. » » ArescH. Alg. Scand. exsicc. N:o 79 et 157. 
Syn. Dumontia contorta Rupr. Alg. Och. p. 295. 
» filiformis ARESCH, Phye. Seand. p. 312. 
» Croa., Fl. Disc. p. 459. 
» Gosr, Algenfl. Weiss. Meer. p. 37. 
» Nyl. et Sel. Herb. Mus. Fenn. p. 74. 
Ulva filiformis Sommerr. Suppl. p. 187. 
» » We. 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 Wauntenserc in Altenfjord, which is the northernmost known locality of the 
species. 
