THE BRYOPHYTA OF ICELAND 



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



The light-coloured stripes are moss bogs, the darker, boggy ground or. on somewhat 



higher levels, patches covered with Vaccinium-Empetrum heath. 



Besides the above-mentioned mosses the following plants are 

 characteristic of the moss bog: 



Brachythecium rivulare 

 Acrocladium cuspidatum 

 Hypnum Kneiffii 

 Bryum ventricosum 

 B. Duvalii 

 Mnium punctatum 



M. Seligeri 



M. cinclidioides 



M. affine var. elatum 



Marchantia porymorpha 



Pellia Neesiana 



But also other Bryophyta from bogs may occur intermixed 

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

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

 sible transitions also occur, between 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. Seydisfjordur, numerous moss bogs on an almost hori- 



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