92 HISTORY OF BRITISH MOSSES. 



and appearance. In exposed situations the stems are short 

 and the projecting hair of the leaf rigid and elongated, while 

 in shady places the former are much extended, and the 

 latter much shortened, resembling some other Mosses 

 natives of woods. 



Var. imherhe: A. ciliatum, var. rtifescens of Arnott. 

 Stem-leaves coloured at the points, those of the perichse- 

 tium diaphanous and serrated. Mountains in the south of 

 Ireland. 



Var. striatum : leaves longitudinally striated or plicate. 

 Rocks in Caernarvonshire, and at Glengariff, Ireland. Both 

 the above varieties have been constituted species in various 

 works on Bryology, but from their varying character and 

 slight differences in external aspect we rank them only as va- 

 rieties of A. ciliatum. A. imherhe is ranked as a Neckera 

 in Miiller's Synopsis. 



SCHISTOSTEGA, Mohr. (Schistostega.) 



Name signifying "cleft lid,'' from the idea of Mohr, 

 that traces of the divisions could be observed in the mature 

 operculum. The genus consists of only one species. 



