THE BHYOPIIYTA OF ICELAND 



553 



Fig. 19. Kaldalon (NW. Iceland). Slightly inclined ground below the stony slope. 



The light-coloured stripes arc nioss bogs, the darkcr, boggy ground or. on somewhat 



higher levels. patchcs covered with Vacciniuin-Einpetriim heath. 



Besides the above-mentioned mosses the following piants are 

 characterislic of the moss bog: — 



Brachythecium rivulare 

 Acrocladium cuspidatum 

 Hypnum Kneiffii 

 Bryum ventricosum 

 B. DuvaHi 

 Mnium punctatuni 



M. Seligeri 



M. cinclidioides 



M. affine var. elatum 



Marchantia polymorplia 



Pellia Neesiana 



But also other Bryophyta from bogs mav occur intermixed 

 with these, especially towards the edge, where the moss bog gradu- 

 ally passes into the commoii bog-vegetation. But of course all pos- 

 sible transitions also occur, betv/een moss bog and bog vegetation 

 as well as between moss bog and the vegetation of the banks of 

 streams, all according to the nature of the underlying substratum. 



As some examples will best show the composition of the moss 

 bogs, the following are given: — 



1. Seydis fjor dur, numerous moss bogs on an almost hori- 



36 



