THE BRYOPHYTA OF ICELAND 



557 



occur everywhere in pools and channels. Hypnum exannulatum, H. 

 revolvens var. Cossoni and Acrocladium cuspidatum are also frequent. 

 In man} r places in East Iceland Cinclidium styginm was found 

 abundantly in Floar, while Hypnum cordifolium and H. fluitans were 

 found in a few places only. 



The moss- covering of the Myri is characterized by the fact of 

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

 sometimes separately in large and small patches. The ground is 

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

 between and upon the knolls, the most hygrophilous species growing 

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

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

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

 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 the ground 

 between the knolls: 



Musci veri 



*Hypnum revolvens 



intermedium 

 stramineum 

 stellatum 

 poly ga mum 

 sarmentosum 

 Lindbergii 

 exannulatum 

 giganteum 

 Richardsonii 

 falcatum 

 trifarium 

 turgescens 



*Camptothecium nitens 

 *Brachythecium rivulare 

 *NE.) Thuidium lanatum 

 *Acrocladium cuspidatum 

 *Philonotis fontana 

 *Meesea trichoides 



Sph agna 



*Sphagnum teres 



rubellum 



Warnstorffii 



fimbriatum 



medium 



Girgensohnii 



* snbnitens 



Meesea triquetra 

 *Paludella squarrosa 

 *Catoscopium nigritum 

 *Cinclidium stygium 

 *Mniurn cinclidioides 



punctatum 



affine 



Seligeri 



subglobosum 

 *Brvum ventricosum 



k> 



*Splachnum vasculosum 

 sphaericum 



*NE.) Dissodon splachnoides 

 *Oncophorus \Vahlenbergii 

 virens 



Dicranum angustum 

 *Fissidens osmundoides 

 *Dichodontium pellucidum 



Campylopus Schimperi 



Sphagnum papillosum 

 inundatum 

 squarrosum 

 acutifolium 

 riparium 

 Lindbergii 



