ba | 
a | 
KONGL. SV. V@LT. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 
Alaria oblonga. Monostroma lubricuin, 
Laminaria Agardhii? » leptodermum, 
» atrofulva, Rhizoclonium pachydermum, 
» nigripes, Chetomorpha Wormskioldii, 
Scytosiphon attenuatus, Ulothrix discifera, 
Phloeospora pumila, Characium marinum, 
Dictyosiphon corymbosus, Chlorochytrium inclusuin, 
» hispidus, Chlorangium marinum, 
Gleothamnion palinelloides, Rivularia microscopica, 
Chetophora maritima, Gleocapsa spec.? 
Thus: 
Midridese:21:3 442... 14 species representing 7 families, 9 genera, 
Fucoide a. Beate ha Se 13(12) » » 5 » q » 
Chlorophyllophyceer 9 © » » 5 » 8  » 
Nostochinee ............. 2 » » 2 » 2 > 
Total sum 38(37) species representing 19 families, 26 genera. 
The number of endemic species, 388 or perhaps only 37, is about 22 per cent of 
the total number of species of the Flora. The following table presents the outlines of 
the distribution of the arctic Flora: 
Species se } 
occurring on the gt eae erates Species known | Species known Species peculiar 
ae sited part of the only from the ; only from the | to the arctic 
| Norway, besides! 4 jo ntie and i TOntHeny 
in the region off po onue aud in : northern Pacific Flora 
the areue Biéts the northern part Atlantic. : ; 
5 ‘| of the Pacific. 
iNav Kapey 2 22 pS el cane ea yg eee ei 4 20 (26) 17 (18) 4 14 
AIRCON Cee ge eee ae eds aa hos as awww ccpaceasze= 3 (4) 20 (23) 22 (24) 3 13 (12) 
| 
Chlorophyllophy cess. -.......-.-.<c-.-des-osens--200- 2 11 15 -- a 
INGNFOUTNG fe eee e a eens esac esee see oct aos ceeded — — 5 — 2 
Total sum 10 (11) 51 (60) 60 (62) 7 | 38 (37) 
If we assume, that the Arctic Sea has been the centre of development not only 
of the endemic species, but also of those species which the arctic Flora has in common 
with the northern Atlantic and the northern Pacific, and besides of those species which 
are known from the Polar Sea on the coast of Norway at the same time as from the 
Arctic region proper, the number of arctic species that may be considered on good 
grounds to have developed themselves within the glacial sea, would amount to 98 by 
the lowest estimate. One more species must, however, surely be added to these, viz. 
Antithamnion boreale, known from the north coast of Norway and the northern part of the 
Pacific. Besides, I believe it can hardly be doubted with regard to those 7 species which 
the arctic Flora has in common with the northern part of the Pacific, that all except one 
have their original home in the Arctic Sea. As respects those species which are found 
