o34 A. HESSELBO 



H. filicinuin has its main distribution in the lowlands up to about 

 300 melres above sea-level, but is also frequentW met with, for instance 

 near Berufjordur and in Esja, up to a height af about 500 metres. 

 At this altilude it grows on rocks in low, dense cushions, more rarely 

 on wet gravelly ground, and these Alpine forms constitute a distinct 

 transition to H. ciiruicaiile Jur., which is perhaps onh' a High Alpine 

 form of H. filicinnm. 



295. Hypnum curvicaule .Jur. 

 Amblystegiiim curvicaule (Jur.) Dicks. & James. 



E. Iceland: Berufjardarskard !, 540 metres above sea-level; Seydis- 

 tjordur!, frequent from about 100—500 metres above sea-level. W. Iceland: 

 Modruvellir!. about 400 metres above sea-level. 



Grows on damp gravelh' ground and rocks on mountain heights 

 up to 500—600 metres. On dry rocks the leaf-cells become longer and 

 narrower and the alar cells more thick-walled. .Xear Seydisfjordur it 

 was collected with quite young fruit 3. 7. 1909). 



296. Hypnum decipiens (De Not.) Limpr. 

 Amblystegium glancnm B. decipiens Lindb. 



E. Iceland: Very common near Seydisfjordur!; Dvergasteinn (H. J.)! 

 N. Iceland: Husavik!; Ljosavatn!; Akureyri!; Oxnadalur!. W. Iceland 

 Brattabrekka!. 



Common from Seydisfjordur in E. Iceland throughout the whole of 

 N. Iceland. The westernmost habitat of this species is Brattabrekka, 

 south of Haukadalur. In the -rest of Iceland it has not been observed. 



Hypnum decipiens grows on very wet, especially gravelly, ground, 

 for instance at the edge of mossbogs or on inundatcd gravelly ground, 

 and along small streams both on the ground and on stones. It hardly 

 ascends higher than about 300 metres, and rarely sets fruit. Near 

 Seydisfjordur, Husavik and Tverå in Oxnadalur it was collected in fruit. 



297. Hypnum commutatum Hedw. 

 Amblystegium glaucum (Lam.) Lindb. 



E. Iceland: Seydisfjordur ;H. J.;!). N. Iceland: Husavik!; Reykjahlid!. 

 W. Iceland: Lundur!; rather frequent in Esja!. S. Iceland: Rather common !. 



Var. falcatum Brid.) C. M. Hypnum falcatum Brid. 



Very common. 



H. commutatum is the more rarely occurring form. It is most 

 frequent in SW. and S. Iceland, where it is especially abundant on wet 

 tutf-rocks. It is rather rare and scanty everywhere else in Iceland. 



Var. falcatum, together with all possible transitions to the type, is 

 one of the most common mosses in the greater part of Iceland. Onlj' 

 in NW. Iceland is it scantv and met with onlv here and there. Both 



