THE BRYOPHYTA OF ICELAND 515 



Occurs here and there on dry stony or moss-grown slopes up to 

 about 200 metres above sea-level, especially in N. Iceland, where it is 

 rather common in many districts (around Eyjafjordur, in Oxnadalur, etc.). 



234. Thuidium lanatum (Stromgr.) Hagen. 

 Thuidium Blandowii (W. et M.) Br. eur. 



Very common from Hoskuldstadr in E. Iceland throughout N. and W. 

 Iceland to Borgarfjordur. In NW. Iceland it occurs here and there, for 

 instance near Isafjordur, Kaldalon and Dvnjandi near Jokulsfjordur, but 

 everywhere scantily only. In E. Iceland it has not been observed south 

 of Berufjordur. and in W. Iceland it appears to be absent from the 

 south of Borgarfjordur. In S. Iceland it has been found rather plenti- 

 fully near Holt and Barkarstadr. 



T. lanatum grows almost always in bogs, where, especially in N. 

 Iceland, it is often the most abundant constituent of the vegetation. It 

 is more rarely met with on \vet, soil-covered rocks. It is most frequent 

 in the lowlands up to about 300 metres; but near Akureyri it is fre- 

 quent even at a height of 400 500 metres above sea-level, and near 

 Barkarstadr up to about 400 metres. Fruit, which occurs everywhere, 

 ripens in the first half of July. 



FAM. HYPNACE.E. 

 235. Orthothecium rufescens (Dicks.) Br. eur. 



Stereodon rufescens (Dicks.) Mitt. 

 W. Iceland: Melar (Grl.)!, sterile. 



236. Orthothecium intricatum (Hartni.) Br. eur. 

 Stereodon snbrufns (Wils.) Lindb. 



N. Iceland : Skagafjordur (Grl.)!; Thrastarholsargil near Eyjafjordur 

 (O. D.)!. S. Iceland: Breidabolstadr!; Skogafoss!; Vestmannaey!. SE. 

 Iceland: Hornafjordur!. 



On Vestmannaey it grew rather plentifully, sometimes on blocks of 

 rock in Heljusdal, sometimes on damp slopes intermixed with other 

 mosses. In the other stations it usually occurred on damp rocks, 

 especially on tuff; thus on the sides of a cave near Skogafoss, and near 

 Hornafjordur on the damp rock-faces near a waterfall. 



237. Orthothecium chryseum Schwagr. (Br. eur.) 

 Stereodon chryseus Mitten. 



Very common in E. and N. Iceland, rather scanty in X\V. Iceland 

 (Dvrafjordur and Sugandafjordur). In W. Iceland it was only found 



