796 



that of the Faeroes, in so far that 4 species helonging to the arctic 

 group, which is quite wanting at the Fgeroes, have been found 

 at Iceland, as also that many more subarctic species occur there 

 than at the Faeroes, the difference is much reduced, if we make 

 the comparison between the algae-flora of South Iceland proper and 

 that of the Faeroes. At South Iceland 82 red and brown species 

 and 26 green and bluish-green have been found, 108 species in all. 

 The following 12 of these species are wanting at the Faeroes: 



Subarctic species: Lithothamnion tophiphorme, Ralfsia deusta, 

 Urospora Hartzii, Cladophora hirta; 



Co Id -boreal species: Rhodochorton repens (endem.), Petrocelis 

 Hennedyi, Rhododermis parasitica, Sphacelaria radicans, S. olivacea, 

 Fucus serratiis, Acrosiphonia flabelliformis (endem.); 



Warm-boreal species: Bonneinaisonia asparagoides, which 

 does not belong perhaps to the flora. 



As mentioned above, there is hardly any doubt, that at any 

 rate some of these species will also be found at the Faeroes, just 

 as, on the other hand, several of the species wanting at the Faeroes 

 may most likely be found at this part of Iceland, especially perhaps 

 at the Vestmanoer. Some of the latter however can hardly be con- 

 sidered to occur there, as for instance some of the most important: 

 Porphyra leiicostida, Callophijllis laciniata with Callocolax neglectiis, 

 Lomentaria articidata, Nitophyllum laceratiim, Polijsiphonia violacea 

 and P. Brodicei, Griffithsia setacea, Cladostephns spongiosus, Piinctaria 

 latifolia, Himanthalia lorea, Halidrijs siliquosa, Bryopsis plumosa, 

 Valonia ovalis etc. The algae-flora of South-Iceland must be regarded 

 as a poorer selection of the Faeroese algae-flora, particularly as some 

 of the warm-boreal species, found at the Faeroes, are wanting there. 



When we turn to North -East Iceland, we see that the dif- 

 ference between the algae-flora there and that at the Faeroes is much 

 greater, as might well be expected. From North- and East-Iceland 

 proper, that is, if we count from the head of Huna-Floi to Lons- 

 hei5i on the south-east coast of Iceland, we have 92 red and brow^n 

 species and 34 green and bluish-green; east of Hornbjarg along the 

 adjacent north-western coast, we have moreover 8 brown and red 

 algae, and 9 green and bluish-green species, namely: Chantransia 

 microscopica , Cystoclonium purpurascens , Polysiphonia nigrescens, 

 "^'Ralfsia ovata, Ascocyclus islandicus, "^Leptonema fasciculatum, ''-'Spha- 

 celaria britannica, Leathesia difformis, '-'Chlorochytrium dermatocolax, 

 Codiolum pusillum, Enteromorpha aureola, ""Ulva Lactuca, ^'Ochlo- 



