CHUlfeTIANIA VTDENSK.-SELSK. FORHANDL. 188 4. No. 12. XI 



except those which are marked with an asterisk. Only 6 of the 

 cosmopolitan messes are pleurocarpical ; 17 are limestone-mosses, 24 

 silicioiis mosses, 21 indifferent as concerns the rock-substratum, 4 ex- 

 dusively tree-mosses. 22 of these mosses are gathered on all ele- 

 vations above the level of the sea. 



The cosmopolitan mosses are as a rule widely dispersed over 

 the Christiania-region, thus 48—52 of these species are gathered 

 in each of the 3 best explored districts and 39 on Ekeberg, 



The distribution of mosses onstations (No. 15 — 19 of table V, 

 page XVI) is in conformity with the observations af Mr. J. Juratska 

 in „Laubmoosflora von Oesterreich-Ungarn", Mr. Boulay's „Muscinées 

 de la France", Mr. Schimper's „Synopsis", Mr. LimpricMs „Laub- imd 

 Lebermoose von Schlesien" compared with my own notes. The mos- 

 ses are distributed on 5 stations: - 15 limestone and clay slate, 

 marl - 16 silicious rocks, clay and sand - 17 trees - 18 rotten trunks, 

 old deals, putrifying animal siibstances - 19 moors and swamps. 



The study of the manner in which the chemical character of 

 the subjacent ground influences the moss-flora, presents at Chri- 

 stiania peculiar difficulties, while on one side the silurian formations 

 are traversed by beds of silicious rocks and on the other side these 

 formations not rarely are interrupted by beds of limy composition. 



As for the moss-flora there is little reason to separate limestone 

 from clay slate, considering that the same species are to be observed 

 on both strata. However some mosses seem to prefer the 

 upper silurian lime-rich formations, as for instance Gymnostomum 

 curvirostre, Mnium orthorrhynchum, Fseudoleskea catenulata, Ortho- 

 thecium intricatum, Rhynchostegium tenellmn, Hypnum Halleri, H. 

 chrysophyllum, H. molluscum and Junger mannia Miilleri. 



On the contrary there is an evident difference as to the moss- 

 flora, between the limestone- and clay-slate rocks on the one 

 side and the silicious rocks on the other. The table IV exhibits 

 this difference in a very manifest manner. 



