536 A. HESSELBO 



300. Hypnum Bambergeri Schimp. 

 Stereodon Bambergeri (Schimp.) Lindb. 



W. Iceland: Breidabolstadr in Reykholtdalur!. 



It was growing there on a damp gravelly flat in company with 

 Ditrichnm flexicaule, Myurella julacea, Tortella tortuosa and T. fragilis. 



301. Hypnum revolutum (Mitt.) Lindb. 

 Stereodon revolutus Mitten. 



Very common over the whole of Iceland. 



It grows both on dr} r and on more or less damp rocks, occasionally 

 also on gravelly soil, and is frequent up to about 600700 metres above 

 sea-level. It varies considerably in size, from quite slender forms (for 

 instance on lava blocks) to very robust forms on damp stones in clefts. 

 Fruit, which was ripe in the middle of July (but the lids still persisted), 

 was found only near Breidabolstadr in S. Iceland, where Hypnum revo- 

 lutum grew in deep cushions, covering stones in a cleft. 



302. Hypnum cupressiforme L. 



E. Iceland: Berufjordur (Grl.;!); Hof!; Hornafjordur!. N. Iceland: 

 Vidvik near Skagafjordur (P. Sofoniasson)!; Vidimyri!; common west of 

 Blondudalur!. W.Iceland: Stykkisholmur! ; Botnsdalur!; common about 

 Esja, Hvalfjordur. Reykjavik and Hafnarfjordur!. S. Iceland: Common!. 

 Vestmannaey!. 



Common from Berufjordur in E. Iceland throughout S. and W. Iceland 

 and the western part of N. Iceland to Blondudalur. In E. Iceland it 

 has not been found further northwards than Berufjordur, and in NW. 

 Iceland it has not yet been observed. East of Hunafloi it has been 

 found only in a few localities near Skagafjordur. 



It usually groxvs on rather dry rocks or on soil-covered rock-ledges, 

 and does not appear to ascend higher than about 300 metres above 

 sea-level. Only sterile specimens have been found. 



Var. ericetoruiN is recorded from Ormarstadir in E. Iceland (leg. H. J., 

 det. C. Jensen), but there are no specimens of it in the collections. 



303. Hypnum hamulosum Br. eur. 

 Stereodon hamulosiis Lindb. 



E. Iceland: Hof!, at an altitude of 100 metres; Hornafjordur!. 

 W. Iceland: Esja, Modruvellir!, on tuft' rocks, 250400 metres above 

 sea-level; Kolvidarhol ! ; common on tuft', from 250 to 450 metres. 

 NW. Iceland: Grun.navik!, at an altitude of about 280 metres. S. Iceland: 

 Holt!; Drangshlid!. Vestmannaey!. 



Rather frequent in the South-western and South-eastern parts of 

 Iceland. It has been found almost everywhere on tuff-rocks, where it 



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