54 KJELLMAN, THE ALG OF THE ARCTIC SEA. 
sibly have issued from D. Bari or from some parent form common to both. Besides, 
there can be adduced no reason why the arctic alge might not be supposed to have 
been more widely distributed formerly in the arctic regions than they are now, which 
is assumed on very good reasons to be the case with the arctic phanerogams. 
What has been said now about Delesseria Berii, may be applied, though with 
one or two modifications, even to the other above-mentioned species, that are met with 
in the Arctic Sea and south of it only in the northern part of the Pacific. By means 
of the table exhibiting the geographical distribution of the arctic alge and the more 
detailed data set forth in the special part of this work, every one may easily convince 
himself of this fact. It is neither necessary nor suitable to enter here into details with 
regard to each species. But I will, however, call attention to one of them, Laminaria 
solidungula, one of the most peculiar and characteristic alge of the Arctic Sea. It is 
found in the Arctic Sea almost circumpolar: in the Greenland Sea, where it is com- 
monly distributed along the whole west and north coasts of Spitzbergen, and not seldom 
attains such a considerable size as to become one of the most magnificent alge of 
the ocean, in the Murman Sea, the Kara Sea, the Siberian Sea not far from the mouth 
of Behring Strait, and in Baffin Bay on the west coast of Greenland. It probably 
erows also in the American Arctic Sea. South of the Arctic Sea it is known only 
from one place, namely the Ochotsh. Sea, from where Ruprecut reports a young »abnor- 
mal specimen. of Laminaria saccharina with undivided scutiform root», which is in all 
probability a young Laminaria solidungula *). 
The present Flora in the northern part of the Pacific differs so essentially in 
composition from that of the Northern Atlantic, that is to say, it contains many species 
that are so sharply distinguished from those of the Atlantic, even belonging to quite 
different types, that in order to account in any way for this fact, one is necessarily 
obliged to assume that these two divisions of the ocean appertain to different areas of 
development, within which different forms have continued to be evolved during a very 
long time. However, on the other hand, it is a well-known fact that the northern 
Atlantic has no inconsiderable number of species in common with the northern Pacific. 
Though it is highly probable, as J. G. Acarpu has rightly remarked, that »a great 
part of the statements about alge occurring in widely distant seas is attributable to 
imperfect knowledge and wrong determinations caused thereby, and that the number 
of such species as are supposed to grow in widely distant seas will be diminished in 
proportion as the accuracy of the scientific determinations increases», and though this 
general judgment may be true even with regard to the reported number of species 
reputed common to the northern Atlantic and the northern Pacific, still there are un- 
doubtedly to be found in these widely separated sea-regions, as the same algologist 
expressly points out, several forms that can be proved to be identical *). The present 
hydrographical conditions being so essentially unlike, it can hardly be assumed that 
these species should have been developed both in the northern Atlantic and in the 
1) Cp. Ruprecut, Alg. Ochot., p. 351 and J. G. AGarpu, Lamin. p. 8 and Grénl. Lamin. och Fue. p. 11. 
2) Cp. J. G. AcGarpu, Spetsb. Alg. Progr. p. 1. Spetsb. Alg. Bidr., p. 10. Grénl. Lamin. och Fue. p. 8— 
9, 11, etc. 
