KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:0 5. 19 
arcta, Cladophora gracilis, Rhizoclonium rigidum, Chetomorpha melagonium and Ch. Worm- 
skioldii. I think I may say that all these are quite as luxuriant in the Arctic Sea as 
when at their best in the Atlantic, or as their nearest relatives there. Lithothamnion 
glaciale for instance forms, as said above, spherical masses of 15—20 cm. in diameter 
on the coasts of Spitzbergen; Odonthalia is larger in the Murman Sea than on the coast 
of Bohuslin, Delesseria sinuosa in the Greenland Sea reaches not seldom a length of 
30 cm. and a breadth of 7 cm.; Sarcophyllis arctica in the Murman Sea has a length of 
above the third part of a meter and a breadth of 20—25 cm. On the north coast of 
Spitzbergen I have seen specimens of Halosaccion ramentaceum more than a quarter of 
.a meter long. Diploderma amplissimum on the north coast of Norway is sometimes 
nearly one meter long by a considerable breadth; bushy speciinens of Dichloria vi- 
ridis, half a meter long, are not rare on the coast af Spitzbergen. JMonostroma fuscum 
on the north coast of Norway and Monostroma Blyttii on the west coast of Greenland 
have not seldom a surface of about half a square meter. Chetomorpha melagonium has 
sometimes in the American Polar Sea a length of 5 feet a. s. 0. As, moreover, those 
species which chiefly decide the aspect of the vegetation, 1. e. the Laminariacee, attain 
in the Arctic Sea such a size and development, that they may be reckoned amongst 
the largest and most luxuriant alge of the Ocean, the vegetation of the Arctic Sea 
must evidently bear a character of uncommon greatness, luxuriancy, and vigour. 
Thus the most prominent features in the general aspect of the arctic marine Flora 
are scarcity of individuals, monotony, and luxuriancy. 
