64 



D. Costate. 



E. Serrate. 



. F. Acuminate. 



Barlramia fomiformis. 



BB. Calyptr.a. conical. 

 C. Capsule cylindric. 



D. Costate. 

 E. Entire. 



F. Acute. 



EE. Serrate. 



D. Costate. 

 E. Entire. 



F. Acute. 



D. Costate. 



E. Serrate. 



F. Acuminate. 



D. Costate. 



E. Serrate at apex. 



Barbula. 



Poganatum brevicaule. 

 Catherinia angustata. 



undulata. 



CC. Capsule urn shaped. 



Pottia truncaiula. 

 Physcomitrium lurbinalum. 

 CCC. Capsule square or angled. 



Polylrichum commune, 

 ohioense. 

 CCCC. Capsule ventricose. 



DD. Ecostate. 



Webera sessilis. 

 Buxbaumia aphylla. 

 II. On trees 

 B. Calyptra cucullate. 



C. Capsule symmetric erect. 



D. Costate. 

 E. Entire. 



F. Acute. 



Drummondia clavellata. 

 Tortella caespiiosa. 



BB. Calyptra mitrate. 

 C. Capsule cylindric. 



D. Costate. 

 E. Entire. 



F. Acute or obtuse. 



Orthotrichum, strangulatum. 

 Ulata crispa. 



