975 



(4) the dry, south-exposed »Hammer« ^ 



The »Hammer« or »Gjov«-side which is moderately humid and 

 favourably exposed will naturally favour the most luxuriant vege- 

 tation. Those which are moist and north-exposed will be charac- 

 terised by an abundance of mosses. The dry south-exposed »Ham- 

 mer« and the gloomy moist »Gjov«-side form a contrast, the former 



184. Luxuriant vegetation on a moist »Hammer« above Trangisvaag on Sydero. 

 (From plioto. by E. Warming.) 



is inhabited by the more typical rock-plants with decided xerophy- 

 tic features, while the latter is the hiding-place of some mosses, 

 some terrestrial algæ, and a few higher planls. 



(1). The sombre and humid »Gjov«-side may be taken 

 first; the following notes from my diary refer to it: 



»A small, very wet and rather gloomy ravine, with its entrance 



^ When the exposure of the two sides of a »Gjov« is more towards east and 

 west, then local conditions determine the degree of moisture and thus also the 

 character of the vegetation (cfr. C. Jensen 1897, p. 192, and Ostenfeld 1901, 

 p. 33); generally there is a distinct difference hetween the two sides of a ravine 

 according as thej' differ in exposure and nioistness. Since a ravine is alwaj's di- 

 stinctlj' humid, \ve never find a Gjov-side which corresponds exactly to our 4th 

 category. 



