176 KJELLMAN, THE ALG OF THE ARCTIC SEA. 
of various kinds, but appears to prefer solid rock or shingle. In the Norwegian Polar 
Sea it belongs to the so-called arctic formation, in the arctic region proper it forms a 
common element of the Corallineace-formation, although it is not wanting in other for- 
inations. Here it occurs sometimes gregarious in large masses. It prefers exposed 
coasts and in the glacial part of the Polar Sea seems not to enter into the interior of 
deep bays. However, on the north coast of Norway I have found it in the interior of 
Altenfjord. On the north coast of Spitzbergen it is found in full vigour throughout 
the year, developing plenty of propagative organs in winter. During this season I have 
found individuals with tetrasporangia in November, December, January, February, and 
March; individuals with sporocarps have been met with in November in plenty and in 
December. Besides, specimens with tetrasporangia have been observed on the coasts 
of Spitzbergen in June, July, August, and October. At Nordlanden individuals with 
tetrasporangia and sporocarps have been collected in July and August, on the coast of 
Finmarken in August; on the west coast of Novaya Zemlya specimens with sporocarps 
have been taken in July, with tetrasporangia in June and July. 
The form litoralis belongs to the litoral zone, as is designated by the name. It 
grew together with Ptilota elegans on the sides of a shallow, grotto-shaped cavity in 
a rock. 
Geogr. Distrib. The present species seems to have its maximum of frequency in 
the Greenland Sea. It grows here where so ever the locality is suitable, in great numbers 
and with large, luxuriant individuals. It is common also on the coasts of Novaya 
Zemlya, although not so much so as in the Greenland Sea, being replaced in the former 
region by Pt. plumosa. On the coast of Finmarken and at Nordlanden it is decidedly 
more scarce than Pt. plumosa, contrary to what seems to be the case in the White 
Sea. The most northerly place where it has been found up to the present time, is 
Treurenberg Bay on the north coast of Spitzbergen, Lat. N. 79° 56’. It is not known 
from the Siberian Sea. 
Localities: The Norwegian Polar Sea: Nordlanden, common, according to KLEEN; 
Finmarken at Maasé, Gjesver, the south coast of Mageré, Talvik, local, but pretty 
plentiful. 
The Greenland Sea: the east coast of Greenland; on the coasts of Spitzbergen 
common and abundant. 
The Murman Sea: the coast of Russian Lapland; on the west coast of Novaya 
Zemlya and Waygats from Matotshin Shar to Jugor Shar common, but less abundant. 
The White Sea: common and abundant. 
The Kara Sea: on the east coast of Novaya Zemlya, scarce. 
The American Arctic Sea: taken by Ricnarpson, according to Harvey. 
Baffin Bay: Cumberland Sound, pretty common; the west coast of Greenland at 
Tessarmiut, Neuherrnhut, Godthaab, Sukkertoppen, Holstenborg, Claushavn, Jakobshavn, 
Godhavn, Rittenbenk. 
The herbarium of the Copenhague Museum contains several specimens of this 
species without any locality being noted. The form integerrima is known to me only 
ee 
a —— a TT 
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