FTTNARIA. 



335 



(c) In dry weather the whole peristome moves upwards, 

 and the slits between the outer teeth become wider ; while 



Fig. 79. FUNARIA. A portion of the Peristome from above, showing two of the 

 outer (exostome) teeth and four of the inner (endostome) teeth. 



in moist air the peristome moves downwards, and the slits 

 between these teeth become closed. This can be readily 

 seen on removing the peristome from a ripe capsule, 



