THE BRYOPHYTA OF ICELAM) 



593 



Ires above sea-level, which wns covered ^vith a conliiiuous carpel 

 of R. canescens, in \vhich Hijlocomiiun parietinnm, Dicrauiim Starckei, 

 ('.onostomnm boreale, Lophozia alpestris and L. hjcopodioides occuned 

 scautily inlerspersed (Fig. 28). 



Fig. 28. Rhacoinilriuin canescens healh iiear Holt iii South Icelaiitl. In tlu« background 

 is seen one of thc dce]) clefts with vertical sides, so comiiion in lliis district. 



Xear Hol" in SE. Iceland tliere was a horizontal, somewhat 

 damp gravelly flat covered wilh a conlinuous moss-carpet, of wiiich 

 Ihe chief species were Rhacomilrinm canescens and Hijlocomhim pro- 

 lifernm, abundantly mixed witli Hijlocomhim parietinnm, H. rngosnni, 

 H. sqiiarrosiim and Hypnnm nncinatiim. Spread about in tlie moss 

 carpet there grew Dicraniim scoparinm. I), congestnm , Ditrichnm 

 flexicaiile , Tortella tortnosa, Polytrichnm jnniperinnm, P. alpiniim 

 and Anlacomniiim tnrgidnm. Conostomnm boreale was common and 

 occurred in small, compact lufts, usually inlerwoven wilb Lophozia 

 nentricosa, Gymnomitrinm concinnatum, Anthelia and species of 

 Cephalozia, and on prominent knoils of eartli Diphijsciiim sessile 

 in association witli Gymnomitrinm concinnatiim formed compacl 

 blackisb-brown coverings. Anlacomniiim tnrgidnm occurred abund- 

 antly in several spots, more or less intermixed with Hylocominm 

 squarrosnm, Hypnnm nncinatnm and Rhacomilrinm canescens, and 

 formed carpets. Spread about in Ibe moss carpet grew nnmerous 



