THE BRYOPHYTA OF ICELAND 



593 



tres above sea-level, which was covered with a continuous carpel 

 of R. canescens, in \\hichHijlocomiiim parietinnm, Dicranum Starckei, 

 Conostomnm boreale, Lophozia alpcstris and L. lycopodioides occurred 

 scantily interspersed (Fig. 28). 





Fig. 28. Rhacomitrium cunescens heath near Holt in South Iceland. In the background 

 is seen one of the deep clefts with vertical sides, so common in this district. 



Near Hoi' in SE. Iceland there was a horizontal, somewhat 

 damp gravelly flat covered with a continuous moss-carpet, of which 

 the chief species were Rhacomitrium canescens and Hylocomium pro- 

 liferum, abundantly mixed with Hylocomium parietinum, H. rngosnm, 

 H. squarrosum and Hypnnm uncinatnm. Spread about in the moss 

 carpet there grew Dicranum scoparium, 1). congestum, Ditrichnm 

 flexicanle , Tortella tortnosa, Pohjtrichum juniperinum , P. alpinum 

 and Aulacomnium turgidum. Conostomnm boreale was common and 

 occurred in small, compact tufts, usually interwoven with Lophozia 

 ventricosa, Gymnomitrinm concinnatam , Anthelia and species of 

 Cephalozia, and on prominent knolls of earth Diphyscinm sessile 

 in association with Gymnomitrinm concinnatnm formed compact 

 blackish-brown coverings. Antacomninm turgidum occurred abund- 

 antly in several spots, more or less intermixed with Hylocomium 

 squarrosnm, Hypnnm nncinatnm and Rhacomitrium canescens, and 

 formed carpets. Spread about in the moss carpet grew numerous 



