KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. wn:o 5. 305 
Evxsice. Syn. Cladophora arcta Kjellm. Vinteralgv. p. 65; Spetsb. Thall. 2, p. 55; Algenv. Murm. Meer. p. 54. 
wot | 
» » Kleen, Nord]. Alg. p. 45. 
» » Wittr. in Heugl. Reise, p. 284. 
» polaris Harv. New Alg. p. 334. 
Conferva arcta J. G. Ag. Spetsb. Alg. Progr. p. 2; Bidr. p. 11; Till. p. 38. 
» centralis J. G. Ag. Gronl. Alg. p. 110. 
» glomerata marina J. G. Ag. Spetsb. Alg. Bidr. p. 11. 
» » Bs) Lindbl. Bot Not. p. 158. 
Remark on the determination of this species. This species is taken here in the wide 
sense given it by ArescHouc |. c. It then includes several forms that may well ap- 
pear rather different and have indeed been described as separate species. Thus Con- 
ferva Arcta Harv. C. centralis Lynes. belongs to it and so do perhaps all Cladophore 
of the group called Comose by Ktrzine (in Spec. Alg.), but at least Cl. stricta, Cl. co- 
mosa, Cl. vaucheriformis, and Cl. sacculifera. However these are all, according to ArE- 
scHouG and Harvey, to be regarded as one and the same species at different stages 
of development and in different forms. I am obliged at present to subordinate my 
own opinion to that of these two great authorities. 
Habitat. This species is litoral in the Norwegian Polar Sea, sublitoral, as far as 
I know, in the other parts of the Polar Sea, growing in 2—10 fathoms water, being 
in both cases sometimes epiphytic on other algw, but usually attached to stones, poles 
a.s. 0. It flourishes on exposed as well as sheltered coasts, both in salt and somewhat 
brackish water. On the north coast of Norway it is generally gregarious in great 
numbers, but in the Arctic Sea proper I have never found but isolated individuals. 
On one occasion I met with a form most nearly coinciding with Conferva centralis 
lying loose on the bottom within the sublitoral zone. The present alga occurs all the year 
round, even in winter, on the north coast of Spitzbergen. I never found any luxuri- 
ant specimens of it during the last-mentioned season, but they were nevertheless in 
full vigour and development. However it is most vigourously developed here in sum- 
mer. I have collected specimens with zoospores in August on the coast of Spitzbergen 
and Finmarken. 
Geogr. Distrib. This species has an extensive range in the Arctic Sea. Its maxi- 
mum of frequency is on the north coast of Norway. Its northernmost certain locality 
is Low Island on the north coast of Spitzbergen Lat. N. 80° 20° 
Localities: The Norwegian Polar Sea: Nordlanden; Tromsé amt at Tromsé, Rend, 
and Karlsé; Finmarken: Maasé, Gjesver, the south coast of Mageré, Talvik, common 
and abundant everywhere. 
The Greenland Sea: Beeren Eiland; the north’ and west coast of Spitzbergen, 
commonly distributed, but in very small numbers. 
The Murman Sea: at several places on the west coast of Novaya Zemlya and 
Waygats, but very scarce. 
The White Sea: Solowetzki Isles. 
The Kara Sea: scarce in Actinia Bay. 
oC 
K. Vet. Akad. Handl. Bd 20. N:o 5. oo 
