792 



saccion CoUinsii, Delamarea attenuata, Coiledesme bulligera, Dictij- 

 osiphon Chordaria, D. corymbosus , D. hispidiis, Saccorhiza derma- 

 todea, Laminaria Agardhii, L. nigripes, Haplospora globosa, Fiicus 

 serratus. Almost half of these species are arctic and subarctic, aild 

 mav not be expected to grow so far south as the Færoes; the 

 others, however, are of a more southern distribution , and some 

 of them may therefore also be found possibly at the Færoes. The 

 majority of the 65 Færoese species absent at Finmark are the same 

 as were wanting at Nordland; some Færoese species not found at 

 Nordland are, however, found here, but on the other hånd Fin- 

 mark lacks the following 19 species: Erythrotrichia ceramicola, Phyllo- 

 phora membranifolia , Pterosiphonia parasitica, Callithamnion arbu- 

 scula, C. polyspermiim, C. corymbosum, Ceramium acanthonotum, 

 Lomentaria articulata, Plocamiiim coccineum, Polysiphonia violacea, 

 P. Brodiæi, Cruoria pellita, Criioriella Dubyi, Rhododermis elegans, 

 Ralfsia vernicosa, Ectocarpus tomentosiis , Cladostephiis spongiosus, 

 Litosiphon Laminariæ, Himanthalia lorea. As already pointed out 

 with reference to Nordland, there is hardly any doubt, that some 

 of the wanting Færoese species may also be found at Finmark 

 though probably in lesser number. 



As to the green and bluish-green algæ, 37 Færoese species (I 

 take it for granted, that Acrosiphonia hamulosa belongs to A. al- 

 bescens) are also found at Finmark; some more species have been 

 found here, but as the determinations in many cases greatly need 

 to be revised, I shall not deal with them any more in this con- 

 nection. 



From this comparison it is seen, that Finmark has a somewhat 

 smaller number of species in common with the Færoes than Nord- 

 land has, and that it has a much greater number of arctic species 

 than the latter country. 



From Norway we pass on to Iceland, and here our comparison 

 has the advantage of the up to date list worked out with much care 

 by Jonsson, in his paper on the marine algæ-flora of this country. 

 As already pointed out by Stromfelt, the algæ-flora of the coasts 

 of Iceland varies greatly. He divides it into two territories: North- 

 East Iceland with an algæ-flora of an essentially arctic character, 

 and South -West Iceland with a north-åtlantic flora. This great 

 difference has been confirmed by Jonsson, who, however, has 

 kindly communicated to me, that the flora ought to be further sub- 

 divided, as the flora of the southern part of the country is purely 



