801 



However, many widely distributed North-European species are, 

 as is well-known, wanting at North-America, e. g. Callophijllis la- 

 ciniata, Lomentaria clavellosa and L. articiilata, Delesseria sangiiinea, 

 Laiirencia pinnatifida, Polijsiphonia Brodiau, Griffithsia setacea, Calli- 

 thamnion scopiilorum and C. arbiisciila , Diimontia fdiformis, PtUota 

 phimosa, etc. On the other hand, the coast of North-America has 

 some species that are wanting at the European coast; of these I 

 may mention: Grinellia americana, Polyslphonia vestita, P. Olnei 

 and P. Harveyi, Callithamnion BaUeyi, Ceramiiim Hooperi, Ectocarpiis 

 Chordarice, E. lutosiis, Stictyosiphon sabsiinplex, Dictyosiphon Macoiini, 

 Scaphospora Kingii; to these must also be added Agariim Tiirneri 

 and Laminaria longicriiris whicli are bolli very common on the 

 coasts of North-America and Greenland, but have not been found 

 further to the east. It is true, tliat Laminaria longicriiris is stated 

 to have been washed ashore at certain places of the European 

 coasts, but it has never been found growing on any substratum, 

 and it is indeed very probable that tliese hollow stalks of Laminaria 

 are fragments of the very similar Laminaria fceroensis, and liave 

 come from the Faeroes or Iceland. 



To what result does this comparison lead? As our know- 

 ledge of tlie florae of several of the countries we liave dealt with 

 is deficient, tlie result can only be somewliat hypothetical. First 

 of all it must be emphasized that the algae-flora of the Faeroes 

 is to be regarded as a scanty selection of that of North-Scotland, 

 with the addition of some few, more northern species not found 

 at the British Isles. If we had a more thorougli knowledge of the 

 algae-flora of the Shetland Isles, the flora of these islands and that 

 of the Faeroes would certainly be found to agree well, just as tlie 

 algae-vegetation of the Shetland Isles, at any rate the littoral vege- 

 tation, agrees well, with that of the Faeroese coasts (compare 9). 

 The Faeroese algae -flora moreover much resembles that of South- 

 West Iceland; the algae of this part of Iceland must be regarded 

 as a somewhat poorer selection of the algae of the Faeroes, still 

 with a few more northern forms than at the Faeroes; lastly there 

 seems to be considerable resemblance between the algae-flora of 

 the Faeroes and that of Nordland. 



When the Danish issue of this paper was published, I did not 

 have the revised list of algae which I have prepared later together 

 with Mr. J 6ns son, and without which a thorough examination of 



