THE BRYOPHYTA OF ICELAND 473 



tain no specimens from these localities it cannot be decided which 

 species is meant. 



129. Pohlia tenuifolia (Schimp.). 

 Webera bulb if era \Yarnst. 



E. Iceland: Hamarfjordur!; Rerufjordur!; Seydisfjordur!. N. Iceland: 

 Geitaskard ! ; Hnausar!. W. Iceland: Reykjavik! J 1 . 



P. tenuifolia is the most frequent of the small gemmiferous species 

 of Pohlia. It usually grows on damp sandy soil, and often very abun- 

 dantly, always bearing the characteristic gemmae. Near Geitaskard it 

 covered in company with species of Bryum the bottom of a dried up lake. 



The leaves in all the Iceland plants are very longly decurrent. 



130. Pohlia grandiflora H. Lindberg. 



S. Iceland: Reykir!; Laugarvatn! $ ; Rarkarstadr !; Midskalagil near 

 Holt!; cave near Steinafjall!. 



Near Reykir it was growing on the ground along a stream, asso- 

 ciated with Dicranella crispa, Pogonatum urnigerum, Scapania curia and 

 Lophocolea minor. Near Laugarvatn it was found abundantly on a warm 

 clayey flat, associated with Aongstrcemia longipes, Gymnocolea inflata and 

 a small sterile Philonotis. $ flowers were very numerous, but gem mas 

 were absent. In the other places it was found on faces of tuff rocks, 

 associated with Bartramia ityphylla, Pohlia cruda, Didymodon rubellus 

 and Distichium montanum. The gemmae were quite typical in all these 

 species. 



Pohlia tenuifolia is an excellent species, easily known, even when 

 gemmae are absent, by the strong sheen and the narrow, longly decurrent 

 leaves, in the upper half of which the cells are very narrow and often 

 wavy. 



\t 



131. Pohlia proligera Lindb. 



N. Iceland: Vidimyri!. 



It grew here rather scantily on damp sandy ground along a stream, 

 bearing typical gemmae. 



132. Mniobryum albicans (Wahlb.) Limpr. 



Pohlia albicans Lindb. 

 Very common. 



Var. glacialim (Schleich.) Limpr. 



Very common. 



Roth the type and the variety are the most common mosses every- 

 where on damp ground. The type grows on the ground along streams, 



The Botany of Iceland. Vol. I. part II 31 



