10 



a. Leaves generally not papillose (exc. some species 

 of Grimmia and Racomitrium). Peristomial teeth not 

 <;ontorted. 



a a. Peristomial teeth with a longitudinal line. 



Fam. 20. Splaclmacese. 



Calyptra conic or subcucullate, very small. Peristo- 

 mial teeth generally entire, seldom finally split. Leaves 

 smooth, flaccid and faintly hygroscopic. 



Capsule straight Avith a swollen neck or an umbra- 

 culiform appendage (apophysis) Leaves broad ; cells usually 

 pellucid and large, the alar ones not defined. Plants often 

 robust, usually growing on animal dung or rotten animals, 

 rarely on rocks or trees. 



Fam. 2L Dicranacese. 



Calyptra cucullate, large or long. Peristomial teeth 

 generally cleft. Leaves not flaccid, sometimes mamillose. 



Capsule often curved, generally narrow. Leaves 

 mostly narrow and subulate-acuminate, often setiform; cells 

 more or less pellucid, the alar ones often dilated and «ub- 

 quadrate. Tufts usually compact and very radiculose. 

 Plants often robust, growing in swamps and woods, less 

 often on rocks or trees. 



h h. Peristomial teeth without longitudinal line. 



Fam. 22. Seligeriacese. 



Calyptra cucullate. Peristomial teeth not cleft. Leaves 

 smooth, not opake. 



Capsule straight, short and thick. Leaves generally 

 setiform and subulate-acuminate without hairpoinl; cells 

 more or less pellucid, the alar ones sometimes (in Blindia) 

 •dilated and subquadrate, often not defined. Plants mostly 

 small and not densely (exc. Blindia) tufted, growing on 

 rocks. 



Fam. 23. Grimmiaceae. 



. Calyptra mostly mitriform, sometimes cucullate. Peri- 



