Leafy Mosses 



when the spores are ripe; in some cases it remains attached to 

 the base of the spore-case when the lid falls; in some cases it is 

 severed from the base and remains attached to the lid. 



Spore-case with Spore-case with 

 columella attached short pedicel and 

 to the base and conical veil, 

 summit. 



Sph&rangiitm muticum. 



Veil. 



Spore-case 

 with lid. 



Snore-case Climacium dendroidet. 



...... (a) Spore-case with lid 



with shnv- Lid with colum- hfted to show teeth, 



elled lid. ella attached. (b) Columella attached 



Gymnostomitm curvvostrum. to the lid. 



In Polytrichum mosses it remains standing in the spore-case 

 and retains at its summit a plate of cells (epiphragm) in the form 

 of a thin membrane to the rim of which are attached the tips of 

 the teeth. 



CoUmlto. 



TeitV. 



Thuidium minuiulum. 

 Vertical section o f 

 double peristome. 



The structure 

 entirely different 

 posed of bundles 

 form. The ends 



Splachnum rubrum. 

 Columella attached to 

 the base of the spore- 

 case ; teeth turned 

 back. 



Pogonatum brevicavle. Up- 

 per part of spore-case with 

 thirty-two teeth surround- 

 "ing the epiphragm. 



of the peristome in the Polytrichum mosses is 

 from that of other mosses. The teeth are com- 

 of thickened fibrous cells arranged in crescent 

 of the crescent point upward and are united 



55 



