337 



This may be accoiintod for more particularly by tbe faet that they 

 are kept down — as Mr. .1. Hartz observes — by tbe all-dominating 

 mosses, wbicb are still better adapted than tbe Hcbens to prolit by 

 tbe moist almospbere. It may also be tbat in a few locaHties tbe 

 violent winds exercise an unfavoiirable influence. Furtber, tbey 

 are nibbled l)y upwards of 100,000 sbeep tbat in tbe Færoes live 

 all tbe year round in tbe open air, and wbicb, naturally enougb, 

 eat wbatever is accessible; but tbe licbens, bowever, are not so 

 numerous tbat tbey can bave great importance as fodder, as when 

 tbey occur gregariously on licben-beatbs. 



If we ask for floristic differences between tbe nortbern and 

 soutbern islands, they are found more particularh^ in tbe distribution 

 of pbanerogams and otber piants; regarding tbe licbens tbe only 

 observation to be made is tbat two very cbaracteristic species 

 Alectoria nigricans and Lopadiiim fiiscoliiteiim are found in tbe 

 nortbern islands only. Tbe former is more arctic tban subarctic 

 and tbe latter is more subarctic. 



We may also compare tbe Licben- flora of tbe Færoes witb 

 those of tbe nearest counlries, Scandinavia, Great Britain and Iceland. 

 Two species are found in tbe Færoes and not in Scandinavia, viz. 

 Nephroma hisitaniciim and Soloria bispora. — Even if tbese types 

 are not really distinct species, yet tbey are notable and cbaracteristic. 

 Tbe former is decidedly Atlantic, tbe latter appears to be more 

 subarctic and arctic. 



Four Færoese species are not found in Great Britain, viz. 

 Pannaria elaeina, Squamaria straminea, Rinodina tiirfacen, Bilimbia 

 cnmidata. Tbese species may be cbaracterized as subarctic and arctic. 

 Here we may remark tbat tbe faet of Crombie in »Licbens of Britain«, 

 I, 1894, baving bardly mentioned any localities from tbe Sbetlands, 

 Orkneys and Hebrides — tbougb otberwise be gives a great many 

 localities — seems to indicate tbat tbese islands must be unexplored 

 as far as tbeir licben-vegetation is concerned, and consequently w^e 

 may suppose Ibat tbe last-named licbens are to be found tbere. 



Tbe following Færoese licbens bave not been found in Ice- 

 land: — 



Leptogiiim saturninnni, Stereocaiilon coralloides, 



— siibtUe, Nephroma Insildnicnm, 



Alectoria bicolor, Sticta aniplissima, 



Cornicularia Iristis, — herbacea, 



