68 HANDBOOK OF MOSSES. 



This group, although separated from the next, has many 

 affinities with it, and would probably be united with it by 

 most botanists. 



Tribe XXIII. Hypnea. Plants of very variable habit; 

 leaves of diverse forms, spreading or squarrose, rarely erect, 

 often secund or falcate, with or without a central nerve, or 

 two-nerved at the base, generally scarious, smooth, and 

 glossy; leaf-cells prosenchymatous (fig. 5,4^), more or less 

 narrowed, sometimes very narrow and vermicular (worm- 

 shaped}, quadrate and enlarged at the basal angles ; vaginule 

 attached to a perichsetial, generally rooting branchlet ; 

 calyptra conical and cleft on one side ; capsule with a long 

 stalk, turned to one side (fig. 5), or horizontal, more or less 

 incurved; peristome double (fig. 5, $ab), generally perfect, 

 with two or three cilia appendiculate or articulate. 



A tribe comprising the single genus Hypnum (fig. 5), but 

 comprising more than 100 species, divided into about 21 

 sub-genera ; many of these sub-genera are considered as 

 genera by leading bryologists. 



