781 



South West Iceland, the warm-boreal group is again reduced (to 

 a little more than 7 Vo) and the cold-boreal group is Hkewise dimi- 

 nished; on the other hånd the subarctic group is much increased 

 amounting to more than 39 °/o, and here we meet with ahnost 2 ^/o 

 of arctic species. If only South Iceland is taken into con- 

 sideration, however, the agreement with the Færoes becomes still 

 more evident, as arctic species are totally wanting and the subarctic 

 group is much reduced in numbers. As Jonsson, however, is 

 preparing a paper on the Icelandic algæ-vegetation in which he in- 

 tends to give a further account of the different smaller groups into 

 which the algæ-flora of Iceland is naturally divided , I shall not 

 enter on this matter here, the more so, as this examination re- 

 quires a very Ihorough knowledge of the algal vegetation of Ice- 

 land. In Finmark the warm-boreal group is further reduced (to 

 4%) and the cold-boreal is likewise a little reduced; the subarctic 

 group is only a little richer in species than that of South West Ice- 

 land, but here we meet with 5^/2 °/o of arctic species. In North East 

 Iceland, we see that the warm-boreal species do not even reach 

 to 1^/0: the cold-boreal species are considerably reduced; the sub- 

 arctic group amounts to almost one half (48.5 Vo) of the algæ of 

 this area, and lastly, almost 9 *^/o of arctic species are found here. 

 On the coasts of the Murman Sea, no warm-boreal species are 

 found, and only 18% of cold-boreal species; almost one half (48 %) 

 are subarctic, and Hiere are more than 15 ^/o of arctic species. 

 Lastly, as to West Greenland, warm-boreal species are likewise 

 totally wanting; there are only 12.5 Vo of cold-boreal species, more 

 than one half of all the species are subarctic (53.8%), and more 

 than 17% arctic. 



As will be clearly seen from the table, the Færoes and Nord- 

 land must be called the habitat of the cold-boreal algæ, 

 as in both piaces almost one half of the algæ belong to this group; 

 next to these countries must be named, on one side the Shetland 

 Isles, on the other South West Iceland. 



2. Comparison with the adjacent Countries. 



A more thorough comparison shows us a good many diffi- 

 culties of various kinds, especially caused by the faet, that the 

 algal vegetations of the different countries have not all been equally 

 thoroughly investigated. It is no wonder, therefore, that the results 

 obtained may suffer from small and large errors. 



50* 



