608 



A. HESSKLBO 



stecjium Sprucei formed thin, dark-green coverings, and where the 

 water flowed down the roof and walls Thamnium alopecunim oc- 

 curred as pure growths. 



A similar vegetation was found everywhere in clefts and caves, 

 and where the conditions pertaining to light and moisture were 

 more varying, the number of the species was still greater than in 

 the vegetation described above. This was for instance the case in 

 the deep and broad Flokastadagil near Breidabolstadr. There, 

 on the damp walls, almost the same species were growing as in 













Fig. 33. Brijn.vipliinin norvccjicum on one of the sides of Flokastadagil. 



Bleiksagil. A high, dry, perpendicular rock-face was for a consi- 

 derable distance entirely covered with a shining, dark-green mat of 

 Bryoxiphium norvegicum (Fig. 33), which has hardly been found 

 elsewhere in such enormous quantities. In other places Grimmia 

 lorqnata covered the rock-sides and blocks with its irregularly-rounded 

 cushions, and Hypnnm palustre was very common everywhere at 

 the water's edge. Neckera complanata was common in dry ditches. 

 At the side of a small waterfall, Klitnafoss, there was a rather 

 large cave, down one side of which some of the water from the 

 waterfall was running. There Thamnium alopecunim grew abun- 

 dantly, while the drier walls of the cave were covered with Enrhyn- 

 chinm Swarliii and Mnium orthorrhynchum. On the ground at the 



