342 bryacejE. 



the inflorescence. Leaves usually large, rounded or more or less 

 elliptic or lingulate, often with a distinct border, frequently 

 spinosely toothed ; nerve rarely longly excurrent ; cells rounded- 

 hexagonal or quadrate-hexagonal, rarely elongate, often large, 

 smooth. Capsule more or less pendulous or horizontal, oblong- 

 cylindric or oval, not pyriform ; lid mamillate, acuminate or 

 rostrate; calyptra very narrow, fugacious. Peristome as in the 

 Section Eu-Bryum of Bryum, but with the cilia smooth or nodose, 

 hardly appendiculate. 



A genus of very fine, handsome mosses, with large pellucid 

 leaves, usually with a border, which is much more distinct than in 

 Bryum, and sometimes thickened ; and with very different 

 areolation, the cells being nearly as broad as long (except at the 

 base) and hardly ever rhomboidal. The capsule also is different, 

 being more frequently horizontal, rarely with a distinct or taper- 

 ing neck, and hence not pyriform in outline ; the lid too is 

 frequently beaked. The prostrate or arched barren shoots are 

 only present in a certain number of our species, in the others the 

 barren innovations are erect, but with the leaves sub-equal, and 

 are usually taller and more slender than the fertile ones. 



/Leaf margin entire 2 



\ Leaf margin toothed 4 



{Marginal cells scarcely distinct, all cells rather elongate u. cinclidioides 

 Marginal cells long and narrow, forming a distinct border 3 



/Margin thickened, 2-4 stratose ; dioicous ; capsule oval T2. functatum 



^\ Margin not thickened, I -stratose ; synoicous; capsule roundish... ij. subglobosum 



,/Ls. not bordered io. stellare 



^\Ls. with thickened border 5 



/Border simply serrate, the teeth single, in one rank 6 



->\Border with the teeth in pairs in a double rank 9 



,/Ls. ligulate, obtuse, undulate 4. undulatum 



\Ls. ovate or roundish, scarcely undulate 7 



/Stem 1-3 inches ; cells 25-40 n 8 



' \ Stem J-i inch; cells about 20 p, lid conic 2. cuspidatum 



„/Dioicous; ls. usually acute ; lid conic /. affine 



\ Synoicous ; Is. usually obtuse ; lid rostrate .3. rostraium 



/Ls. lanceolate, scarcely decurrent ; lid mamillate .5. hornum 



*\Ls. wider, with longish decurrent wings ; lid conic, rostrate 10 



/Plant tall, robust; ls. 2-3 lines long 9. spinosum 



\ Plant smaller, £-1 inch ; ls. 14 line or less II 



/Cells hexagonal, small, about 12-15 V- 1 dioicous 7. orthorrhynchum 



\ Cells rounded at the corners, about 20 p. 12 



/Synoicous; ls. close together on stem 6. serratum 



\ Dioicous ; Is. more distant, much shrivelled on drying 8. riparium 



1. Mnium affine Bland. (M. cuspidatum Neck., Braithw. 

 Br. M. Fl.) (Tab. XLVI. C). 

 Stems usually moderately tall, with long sterile shoots 

 arched or -prostrate ; bright pale green, loosely tufted, 1-2 inches 



