294 KJELLMAN, THE ALG OF THE ARCTIC SEA. 
Halitat. In the Norwegian Polar Sea this species is litoral, attached to stones, 
growing scattered in sheltered localities. I have collected individuals with zoospores 
(gamets) in September on the coast of Finmarken. 
Geogr. Distrib. It is known with certainty from the Norwegian Polar Sea, in 
the northern part of which it is scarce, and from Baffin Bay. As I do not know if 
U. latissima Scutser. |. c. is to be referred to this species, I cannot decide whether it 
occurs in the Murman Sea. J never observed it there myself. The most northerly 
place where it is as yet certainly known to grow is Oxfjord on the coast of Finmarken 
about Lat. N. 70°. 
Localities: The Norwegian Polar Sea: Nordlanden probably common and rather 
-abundant; Finmarken local and scarce at Oxfjord and Talvik. 
The Murman Sea: (?). 
Baffin Bay: the west coast of Greenland near Godhavn according to specimens 
in the herbarium of the Copenhague Museum. 
Gen. Monostroma (Tuur.) Wirrtr. 
Monostr. p. 15; THur. Note s. Ulv. p. 29, sec. Wirtr. |. c.; lim. mut. 
Monostroma latissimum (Ktrz.) Wirrr. 
Monostr. p. 33. Ulva latissima Kurz. Phye. gener. p. 296. 
Descr. Monostroma latissimum Wirrr. |. ec. 
e, A. 
Fig. » » » Dy tine cl ia: 
Exsice. » » Wirrr. et Norpst. Alg. exsice. N:o 145. 
Syn. Monostroma arcticum Kuiegen, Nordl. Alg. p. 41; sec. spec.; ex parte. (?). 
» latissimum Kuigen, Nord]. Alg. p. 41 (?); ex parte(?). 
Remark on the synonymy. Kueen records M. latissimum in Nordl. Alg. The spe- 
cimens of his collections which bear this name, do not however belong to the present 
species but to Jf. saccodeum. On the contrary that alga which is called J. arcticum 
in his collections, is in fact MM. latissimum. Of M. arcticum no specimens are to be 
found there. It is certain, accordingly, that M. latissimum really exists at Nordlanden, 
but it is uncertain whether it is included under this name in Nordl. Alg. and whether 
KLEEN has really found MW. arcticum. His statement of its occurrence in brackish water, 
directly contrary to my own observations, seems to show that he has confounded M. 
arcticum and M. latissimum. Still it is possible that M. arcticum, which is rather 
common in Finmarken at certain places, is really to be found in Nordlanden, and that 
KneEn’s determination is correct, although the specimens collected have happened after- 
wards to be confounded. 
Habitat. There is nothing known with certainty about the habitat of the present 
species in the Polar Sea. If I. arcticum Kuiren Nordl. Alg. should be exclusively the 
present species, this would be a brackish-water alga at Nordlanden, as it is often else- 
where, growing in the lower part of the sublitoral zone, attached to other alge. 
