778 



It is clear from this summary that the Rhodophijcece are most 

 numerous, contributing ahiiost Vs of all the species collected. The 

 Phceophycece are a little less numerous, about ^/s of all the marine 

 algae- species of the Faeroes; next come the Chlorophycece , wliich 

 only amount to a little above Vs, and lastly the Cyanophycece, of 

 whicli only a few species have been collected, 



Rosenvinge (71, p, 173) has given a summary in per centages 

 of the number of species belonging to each of the four classes of algse, 

 as they occur in the algae-florse of Greenland, the Britisli Isles and 

 in the Spanish-Canar}^ region. If the numbers that represent these 

 groups in the Fseroese algae-flora are placed in tliis summary, and 

 if, at the same time, the numbers representing the Greenland algae 

 are altered to agree with the latest contributions concerning the latter, 

 and the numbers from the British Isles are calculated from B al- 

 ter s's latest list (4), the result will be as follows: 



« 



^ 1 J T-i T- •• The British 

 Greenland The Fieroes 



! Isles 



The Spanish- 

 Canar}' Reg, 



Rhodophyccce 



Phceophycece 



Chlorophycece 



Cyanophycece 



1 



26.0 % 



40.0 % 



30.0 % 



6.0 % 



38.6 % 42,3 % 



34.0 % 27.8 % 



20.9% 17.9% 



6.5% 12.0% 



60,4 % 



18.7% 



14.8% 



6.1 % 



Total number of species. . 



169 



215 ! 744 



492 



As clearly shown b}' the figures, the Faeroes hold an inter- 

 mediate position between Greenland and the British Isles; the Rhodo- 

 phycece, which are in the majority in England, to say nothing of 

 the Spanish-Canary region, are still predominant on the Faeroese 

 coasts; whereas the Phceophycece, which are vastly in the majority 

 in Greenland almost reach to the same number. 



The Chlorophycece likewise hold an intermediate position as 

 regards number of species between the British Isles and Greenland, 

 where they are relatively more numerous; the same may be said 

 of the Cyanophycece, only inversely, as these are more numerous in 

 the British Isles and less numerous in Greenland. That only a re- 

 latively small number of the latter have been found in the Spanish- 

 Canary region, is certainly due to the fact that this region (as regards 

 the Cyanophycece) has hitherto been but very little investigated. 



It is, on the whole, a well-known fact that the Phceophycece 



