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. 



Spharangium muticum. 



Veil. 



Spore-case 



Spore-case with shriv- Lid with colum- 



with lid. elled lid. ella attached. 



Gymnostomum curviroslrum. 



Climacium dendr aides. 



(a) Spore-case with lid 

 lifted to show teeth. 



(b) Columella attached 

 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. 



Thuidium minululum. 

 Vertical section o f 

 double peristome. 



The structure 

 entirely different 

 posed of bundles 

 form. The ends 



Splachnum rubrum. 

 Columella attache d to 

 the base of the spore- 

 case; teeth turned 

 back. 



Pogonalunt brevicaule. Up- 

 per part of spore-case with 

 thirty-two teeth surround- 

 ing the epiphragm. 



of the peristome in the Polytriclium 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 



