798 



The 104 Fseroese species which have not been found at North- 

 East Iceland are divided into the following groups: 



The subarctic group: Chantransia efflorescens, Ch. virgatiila, 

 Harveijella mirabilis, Sorapion Kjellmani, Perciiisaria perciirsa, Pilinia 

 maritima, lUvella confhiens, Pringsheimia scutata, Spongomorpha ver- 

 nalis. All these 9 species will most likely be found at North-East 

 Iceland. 



The boreal-arctic group: Polysiphonia elongata and Riviilaria 

 atra, both of which will certainly also be found at North East Iceland. 



The cold-boreal group includes the great majority, namely, 

 66 species, but I need not mention themhere; some of them may 

 perhaps be found at North East Iceland, but most of them pro- 

 bably not. 



Lastly, the warm- boreal group includes 27 species, none of 

 which probably are to be found on the coasts of North-East Iceland. 



If w^e now pass on to Greenland, we find, according to Ro- 

 senvinge (71, p. 166 — 172), that the total number of species is 167, 

 wiien the algae-flora of both West and East Greenland is included. 

 To this number must be added Adinococcus sabcntaneiis which 

 Rosenvinge did not accept as a species, according to Darbi- 

 shire's view^ at that time. According to Jonsson (42), w^e must 

 further add 7 species, firstly Microsyphar Polysiphoimv, then Ro- 

 senvinge's Spongomorpha arcta includes Acrosiphonia inciirva, 

 A. hystrix and A. penicilliformis; also 3 species of Ulothrix must 

 be added : U. pseudoflacca, U. scutata and U. subflaccida, whilst U. 

 consociata is partly the same as Rosenvinge's U. implexa. Lastly, 

 Rosenvinge's Sphacelaria olivacea includes Sphacelaria radicans 

 and Sph. britannica. Thus the number of species we know from 

 Greenland becomes 176. According to my judgment of the species, 

 Enteromorpha prolifera must, how^ever, be wdthdraw^n, and accor- 

 ding to Fos lie's latest view^s the 12 species of Lithothamnion men- 

 tioned by Rosenvinge must be reduced to 6^; the total number 

 of species thus becomes 169. At the Fseroes we meet wdth 104 of 

 these species. The Faeroes have 108 species (+ 3 only determined 

 as to the genus) that are not found at Greenland, but on the other 

 hand, we find 65 species there that do not grow at the Fseroes; 

 thus 49^/0 of the 212 Fseroese algae are common to both countries. 



^ Lithothamnion botryoides, L. fl'ibellatnm, L. colliciilosuni and L. varians 

 being referred to L. glaciate, and L. circumscriptum to L. compactum. L. investiens 

 is doubtful at Greenland and L. fri.iiculosum is the same as L. intermedium. 



