4* MUSCI. 



28. T/mmia. Outer peristome of 1 6 teeth ; lacinice of the inner 

 variously united at the base by transverse bars and frequently 

 cohering at the points. Calyptra dimidiate. 



29. Bartramia. Outer peristome of 16 teeth ; lacinice of the 

 inner 16, equal, bifid. Calyptra dimidiate. (Capsule mostly 

 globose.) 



30. Buxbaumia. Outer peristome of numerous filiform, erect, 

 jointless teeth ; the inner a plaited membranous cone. Capsule 

 oblique. 



Sect. II. Seta or fruitstalk lateral. Pleurocarpi. 

 Subsect. I. Mouth of the capsule naked. Gymnostomi. 



31. Hedwigia. Calyptra dimidiate. 



Subsect. II. Mouth of the capsule furnished with a peristome. 

 Peristomi. 



Div. I. Peristome single. Aploperistomi. 



32. Pterogonium. Peristome of 1 6, entire, equidistant teeth. 

 Calyptra dimidiate. 



33. Leucodon. Peristome of 32 teeth, closely united in 

 pairs. Calyptra dimidiate. 



Div. II. Peristome double. Diploperistomi. 

 A. Internal peristome composed of free cilia. 



34. Neckera. Outer peristome of 16 teeth ; cilia of the inner 

 16, sometimes connected at the base by a very short membrane. 

 Calyptra dimidiate. 



35. Anomodon. Outer peristome of 1 6 teeth ; cilia 16, aris- 

 ing from the side of the teeth. Calyptra dimidiate. 



36. Daltonia. Outer peristome of 16 teeth; cilia 16, arising 

 from the side of the teeth. Calyptra mitriform. 



B. Inner peristome composed of cilia united below into a membrane 

 or connected by transverse bars. 



37. Fontinalis. Outer peristome of 16 teeth ; cilia of the 

 inner 16, connected by transverse bars, forming a reticulated 

 cone. Calyptra mitriform. 



38. Hookeria. Outer peristome of 16 teeth; inner of 16 

 cilia, united below into a membrane. Calyptra mitriform. 



39. Hypnum. Outer peristome of 16 teeth ; inner a mem- 

 brane cut into 16 equal segments, with filiform processes fre- 

 quently placed between them. Calyptra dimidiate. 



