THE BRYOPHYTA OF ICELAND 



557 



occur everywhere in pools and channels. Hijpniim exanmilatum, H. 

 revolvens var. Cossoni and Acrodadium cuspidatiun are also frequent. 

 In many piaces in East Iceland CAnclidium stijginm was found 

 abundantly in Floar, while Hypniim cordifoUum and H. fhiitans were 

 found in a few piaces only. 



The nioss-covering of the Myri is characterized by the faet of 

 its being rich in species, which grow sometimes greally intermixed, 

 sometimes separately in large and small patches. The ground is 

 iisually knolly, and there is a great difference in the vegetation 

 between and upon the knolis, the most hygrophilous s})ecies growing 

 on the wet ground between the knoils, while on the top of the 

 knoils mesophilous and xerophilous forms are met with, and be- 

 tween these all transitions occur, according to the height of Ihe 

 knoll and the degree of moisture. They are nearly the same 

 species which are everywhere the most abundant constituents of 

 the Myri vegetation. The following species occur on Ihe ground 

 between the knoils: — 



— Richardsonii 



— t'alcatum 



— trifarium 



— turgescens 

 *Camptothecium nitens 

 *Brachythecium rivulare 



*NE.) Thuidium lanatum 

 *Acrocladium cuspidatum 

 *Philonotis fontana 

 *Meesea trichoides 



*Bryum ventricosum 

 *Splachnum vasculosum 



* — sphæricum 

 ^*NE.) Dissodon splachnoides 

 *Oncophorus Wahlenbergii 



* — virens 

 Dicranum angustum 



*Fissidens osmundoides 

 ^Dichodontium pellucidum 

 Campylopus Schimperi 



