LEAF KEY TO GENERA 



A. Fruit at the apex of the stem or of a well-developed 

 branch, sometimes appearing lateral by the new growth 

 of the plant. Stems generally erect, and often not 

 branched; or, if slightly branched by forking, usually 

 with not more than two or three branches.^ Acrocar- 

 pous Mosses, p. 77. 



B. Fruit on the side of the stem or on a very short lateral 

 branch. Stems prostrate or ascending, rarely erect, 

 usually much branched (with more than two or three 

 branches).^ Pleiirocarpous Mosses, p. 172. 



Note. In many cases the genus can be determined without the aid of 

 the capsule. When in doubt where to place a sterile moss that is 

 somewhat branched, try it under both Division A and Division B. 



A 



{Fissidens, p. 97, with fruit both terminal and lateral may be found here) 



Plants growing on the ground 



I. SHAPE OF LEAVES WHEN MOIST NOT EASILY SEEN 



(Leaves too small or too closely folded to show if they are relatively long and 

 narrow or short and broad) 



Stems one-half inch long or less. 



Capsule erect . . . . 2, 15, 16, 38, 40. 

 Capsule not erect .... 25, 28, 34, 37. 



^ For arrangement of branches sec " Illustrations of Terms," Plate II. 



