THE BRYOPHYTA OF ICELAND 517 



in very extensive mats. It ascends to a height of about 400 metres 

 above sea-level, and, for instance in Esja, is found abundantly even at 

 an elevation of between 300 400 metres, on dry. steep rock-ledges. 

 Fruit was found only near Breidabolstadr in S. Iceland, and in July it 

 was empty of its spores. 



243. Camptothecium lutescens (Huds.) Br. eui. 



Hypnum lutescens Huds. 



Iceland ;Wiinstedt N i!. X. Iceland: Hnukr in \ 7 atnsdalur (St.)!; com- 

 mon near Geitaskard in Blondudalur !. N\V. Iceland: Dyrafjordur!. 

 W. Iceland: Breidabolstadr!; Lundur!; Esja!; Reykjavik (Grl.;!). S.Ice- 

 land: Common!; Vestmannaey !. E. Iceland : Djupivogur!; Hornafjordur!. 



Common in the southern and western parts of the country from 

 Hornafjordur in East Iceland to Blondudalur in North Iceland. It has 

 not been found in the remaining part of North Iceland or in the greater 

 part of East Iceland from Berufjordur northwards, and it is rare in 

 North-west Iceland. It usually grows on dry, stony or grass-covered 

 slopes or in coppices, occasionally also on rocks, but hardly extends 

 higher than 200300 metres. 



The leaves in Ihis species have occasionally in their upper part 

 cells which are shorter, and the angles of which are more or less 

 distinctly shaped like a papilla. This is most distinctly seen in the 

 forms from Reykjavik and Djupivogur, both of which grew on rocks. 



244. Camptothecium nitens (Schreb.) Schimp. 

 Hypnum trichoides Neck.. Lindb. 



Very common. 



One of the most frequent mosses on wet rocks. It occurs also 

 frequently on soil-covered rocks or on more dry ground mixed with 

 other mosses. In bogs it often forms the bulk of the vegetation and 

 ver3 T frequently sets fruit, which ripens in the beginning of July. It 

 occurs most frequently and abundantly in the low land, but ascends, 

 however, to 400 500 metres above sea-level. 



The tomentose form is by far the most frequent. The smooth 

 form, var. atrichnm Kindb.. appears to grow especially on rocks. It was 

 found abundantly on soil-covered rocks close to the coast below Geit- 

 hellir in E. Iceland. 



245. Brachythecium Mildeanum (Schimp.) Schimp. 



E. Iceland: Seydisfjordur (H. J.)!; Hamarfjordur!. S\V. Iceland: Ala- 

 foss!. 



On wet boggy ground; near Hamarfjordur it grew abundantly on 

 inundated ground along the river. 



