448 A. HESSELBO 



41. Fissidens adianthoides (L.) Hedw. 



N. Iceland: Hof near Eyjafjordur, fr. (O. D.)!. W. Iceland: Klepp- 

 jarnsreykir (Grl.I); Laugarnir near Reykjavik (Grl.)!; bog near Reykjavik, 

 fr. !; Kollafjordur! 



Rare and scantj' on bogg}' or warm ground. 



Note. Fissidens taxifoliiis is recorded by Zoéga and Hornemann 

 from Iceland without finder, habitat or specimens in the collections) 

 and by Gronlund from Myvatn; but Gronlund's specimen belongs to 

 F. osniundoides. 



42. Fissidens decipiens De Not. 



W. Iceland : Sandur (H. J.)!; Hafnarfjordurl. 



This plant gi'ew in both localities in lava-clefts, associated with 

 Lejeiinea serpyllifolia. 



Fam. seligeriaceæ. 



43. Blindia acuta (Huds.) Br. eur. 



Very common on wet rocks in or bj- rivers and waterfalls up to 

 about 400 — 500 metres above sea-level, occasionally also on the ground 

 and often in great abundance. The fruit, which is almost ahvays pre- 

 sent, ripens in the beginning of July. 



At a greater altitude it occurs more scantih% but may nevertheless 

 be met with as far upwards as 600—700 metres. 



Fam. DITRICHACEÆ. 

 44. Ceratodon purpureus (L.) Brid. 



Common on rocks, lava-flats, sandy soil, peat, etc. especially in 

 N. and NW. Iceland, and on lava-flats in the interior of the country. 

 It is less frequent in E. and S. Iceland. The fruit, which is usually 

 present, ripens in the first half of July. 



It varies considerably, especially in leaf-form. Forms with shortly 

 pointed or almost obtuse leaves (var. brcvifoliiis) are the most frequent. 



45. Ditrichum tortile (Schrad.) Lindb. 



E. Iceland: Seydisfjordur!, sterile. 



It was growing there on damp gravelly soil along a river, inter- 

 spersed in a Hepaticæ-mat formed by Ålicularia scalaris, A. geoscypha, 

 Anthelia Juralzkana, Lophozia ventricosa, etc. 



46. Ditrichum nivale (C. M.) Limpr. 



E Iceland: Berufjardarskard !, at an altitude of about 500 metres, fr. 

 The plant was growing very scantilj' in a cushion of Anlhelia 

 Jiiratzkana. 



