THE BRYOPHYTA OF ICELAND 657 



fjords which open out towards the north-west, lies rather isolated, 

 separated as it is from North and West Iceland by Jokulls and 

 lofty mountain-ridges. The boundary between North and West Ice- 

 land is rather undefined. Several species which are common in 

 West Iceland, but rare in or absent from North Iceland, are met 

 with right in around Hunafloi. Here the range of hills east of 

 Blondudalur appears to form a natural boundary, since Campto- 

 theciam hitescens and Rhacomitrium heterostichum, for instance, have 

 not been found east of this line, whilst other species common in 

 North Iceland, for instance Orthothecium chryseum, Hypnum dedpiens 

 and Thuidium lanatum, are rare west of it. 



Of the 87 Hepaticse, 17 Sphagna and 322 Musci veri enumerated 

 in Table II, 30 Hepaticse, 4 Sphagna and 108 Musci veri (or col- 

 lectively 33 /o), are almost equally frequent in all the districts of 

 Iceland, the frequency being (with a few exceptions) 3 4. The rest 

 of the species can be grouped as follows: 



1. Species with a mainly Southern distribution. 



2. Northern and Eastern distribution. 



3. Western distribution. 



4. Species which occur sporadically in several of the districts of 

 Iceland. 



1. Species with a mainly Southern Distribution. 



a. Found only in South Iceland (the figure denotes frequency). 



Meridional. Scleropodium purum 3 



Eurhynchium Swartzii 3 



Reboulia hemisphaenca 3 _. 



Stockesn 2 



Fegatella comca 4 _, 



TA * Rhvnchostegium murale 1 



Fossombroma Dumortieri 1 , " . ., . , 



lx .~j Plagiothecmm elegans 1 



Aneura multifida 1 



T . ,, ,. depressum 1 



Jamesoniella autumnalis 1 



Lophozia excisa 1 



., Boreal. 



Lophocolea cuspidata 1 



Lepidozia setacea 1 Haplo/Ja riparia 3 



Weisia viridula 1 Sphagnum compactum 1 



Tortula muralis 1 Pohlia grandiflora 2 



mucronifolia 1 Amblystegium salinum 1 



Hedwigia albicans 1 Hylocomium pyrenaicum 1 



Orthotrichum anomalum 1 



saxatile 1 Alpine. 



cupulatum 1 Scapania Bartlingii 1 



Mnium undulatum 3 Dicranum fulvcllum. ..,.._..... 3 



Anomodon viticulosus 1 Bryoxiphium norvcgicum 3 



Thuidium tamariscinum . 3 Tortula obtusifolia. 1 



