536 A. HESSELBO 



300. Hypnum Bambergerl Schimp. 



Stereodon Bambergcri (Schimp.) Lindb. 



W. Iceland: Breidabolstadr in Reykholtdalur!. 



It was growing tliere on a damp gravellj' flat in company with 

 Ditrichum flexicaiile, Myiirella jiilacea. Torleila tortnosa and T. fragilis. 



301. Hypnum revolutum (Mitt.) Lindb. 

 Stereodon reuolutus Milten. 



Very common over the whole of Iceland. 



It grows both on dry and on more or less damp rocks, occasionally 

 also on gravelh' soil. and is frequent up to about 600—700 metres above 

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

 instance on lava blocks to ver}' robust forms on damp stones in clefts. 

 Fruit, which was ripe in the middle of July (but tlie 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 I. 

 Yestmannaey!. 



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 tlian 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 grows on rather dry rocks or on soil-covered rock-ledges. 

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

 sea-level. Onlj^ sterile specimens have been found. 



Var. ericelorum 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 hanuilosus Lindb. 



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

 W. Iceland: Esja, Modruvellir!, on tuff rocks, 250—400 metres above 

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

 NW. Iceland: Grunnavik!, at an attitude of about 280 metres. S. Iceland: 

 Holt!; Drångshlidl. Vestmannaey !. 



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

 Iceland. It has been found almost evervwhere on tufT-rocks, where it 



