CHRISTIANIA VIDENSK.-SELSK. FORHANDL. 1884. No. 12. XIII 



It appears from this list that of 314 mosses observed near Chri- 

 stiania 71 are to be considered as lime-mosses, 165 as silicious mosses 

 and 78 or 25 7o as indifferent respecting the substratum. Of the 

 hepaticae 4 only may be regarded as almost exclusively lime-spe- 

 cies and 17 as exclusively silicious species. The proportion between 

 the mimber of species on silicious rocks — and on limestone and 

 clay slate rocks at Christiania is about as 3:2. 



In the interesting essay „Études sur la distribution géogra- 

 phique des mousses en France" and in the classical work „Mus- 

 cinées de la France" Mr. Boulay distributes the French mosses 

 on 3 botanical regions: - 1 the mediterranean - 2 the wood-region 

 and - 3 the alpine. The wood-region is divided into 3 zones - 1 the 

 inferior - 2 the middle and - 3 the subalpine. The moss-flora of Chri- 

 stiania belongs to the middle-wood region considering that more than 

 200 mosses are common with the corresponding region of France; 

 and the mean temperature at Christiania also falls between the 

 limits of the mean temperature of this zone. 



About the same number of mosses are common for the terri- 

 tory of Christiania and the 2 other zones of the wood-region 

 in France. Not less than about 150 mosses at Christiania are ob- 

 served in the alpine region of France. Some of these are cited 

 page 18 where the asterisk signifies that they are also coUected at 

 Spitzbergen. 3 of those mosses are not observed at Christiania 

 lower than 300 m. above the level of the sea; 11 not lower than 

 150 m, 2 scarcely lower than 100 m and 25 already at 60 m, or 

 almost at the level of the sea; of genuine mediterranean mosses 

 only 2 have been collected at Christiania: Trichostomum crispulum 

 and Rhynchostegium tenellum, the latter in sunny crevices of 

 clay slate rocks. 



Abbreviations: 



Bl and Bhjit = Professor M. N. Blytt. 

 Ax, Bl = Professor Axel Blytt. 



K = F. C. Kiær. 



Kl. = B. Kaalaas. 



