HYPNBI. 133 



which are remarkably large. In general appearance it re- 

 sembles slender varieties of H. cupressiforme. Wilson sus- 

 pects that it may eventually prove to be a Leskea. 



9. PTYCHODITJM, Schimper. 



Sporangium irregular or subcylindrical ; peristome double ; 

 inner peristome short, without intermediate cilia or with nearly 

 abortive processes. — Mosses with plicate leaves [vTv^aihr]^, 

 plicate) and tomenlose stems. 



1. P. plicatum, Schimp. ; dioicous; stem more or less 

 procumbent, irregularly branched; leaves ovate, acuminate, 

 subsecund, strongly plicate; margin entire, recurved; nerve 

 strong, reaching nearly to the apex ; sporangium horizontal or 

 cernuous, nearly symmetrical. — Hypnum plicatum, Wils, Sf 

 Hook. p. 339, t. lv. 



In shady crevices on mountains. Ben Lawers. More com- 

 mon in Switzerland on calcareous than granitic rocks. 



Dioicous; creeping below, above erect and irregularly 

 branched, of a yellow glossy green, the branchlets often curved, 

 in consequence of which the leaves are inclined to be secund, 

 more or less covered with small multifarious paraphylla; leaves 

 broadly ovate, very acuminate, entire, with a strong nerve 

 reaching almost to the tip ; cells narrow, elongated, hexagonal ; 

 fruitstalks principally on the main stem, short, springing from 

 large pale perichsetial leaves, twisted below to the left when 

 dry, and to the right above, smooth and shining, bright red ; 

 sporangium small, narrowly elliptic. 



Schimper has separated this genus, which will not come 

 under the definition given above of Hypnum, from Brachythe- 

 cium on account of the tomentose stem, imperfect inner peri- 

 stome, and different reticulatio'n ; and from Camptothecium 

 for the two latter reasons, and its more symmetrical sporan- 



