KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 133 
the plants in question are so strongly differentiated from one another, that they ought 
to be regarded as separate species which have issued, probably not long ago, from one 
or two fundamental types. 
Habitat. D. Barii is in the Arctic Sea a sublitoral alga occurring within the 
formation of Laminariacew and apparently preferring exposed coasts to the interior of 
deep bays and other sheltered places. It is usually fastened to other alyw, especially 
to the rhizines of the Laminariacew. On the north coast of Spitzbergen I have found it 
in full development in the middle of February. Specimens with sporocarps were met 
with on the west coast of Novaya Zemlya in June and July, at Spitzbergen in August; 
specimens with tetrasporangia at both these places in the month of July. During the 
development of the spores part of the branches are dissolved, but at the end of that 
time a vigorous development of new vegetative parts sets in, by which a great number 
of the new branch-systems are produced in the axils. 
Geogr. Distrib. This species is known only from the arctic region of the Polar 
Sea, and in this region it has a pretty narrow range. For it has been found only in the 
eastern part of the Greenland Sea and in the Murman and the White Seas. Its maxi- 
mum of frequency seems to be in the White Sea and in the eastern part of the Murman 
Sea. The most northerly place where it has been met with, is Musselbay on the north 
coast of Spitzbergen, Lat. N. 79° 53’. 
Localities: The Greenland Sea: the north and west coasts of Spitzbergen, pretty 
common, but not abundant. 
The Murman Sea: at several places on the coast of Russian Lapland and Cisu- 
ralian Samoyede-land, Kolgujew Isle, the west coast of Novaya Zemlya from Matotshin 
Shar to N. Gusinnoi Cape, on the latter coast more plentiful and luxuriant than at 
Spitzbergen. 
The White Sea: pretty common and abundant. 
Delesseria corymbosa J. G. Ag. 
Spec. Alg. 2, p. 684. 
Descr. Delesseria corymbosa J. G. AG. |. ¢. 
Fig. » » tab. nostra 10, fig. 3. 
Syn. Delesseria angustissima Croaut, Fl. Dise. p. 459(?), 
Habitat. It appears to belong to the sublitoral zone and to the formation of 
Laminariacee. In support of this view I can quote the inscription of a label by J. 
Van »In stipibus Laminariw saccharin». 
Geogr. Distrib. It is known only from Baffin Bay. Only one Locality is quite 
sure, namely Godthaab on the west coast of Greenland. If however, as seems most 
probable, Croatyt’s D. angustissima is the present species, it is reported also from dJa- 
cobshavn, which is, in that case, the most northerly locality where it is at present 
known to grow, about Lat. N, 69° 15. 
