MUSCI AND HEPATICAE 



461 



offers for it. In cither case they are dependent for their normal 

 development on sufficient water-supply : and this directly determines 



Fig. 355- 



Catharinea {Atrichum) unduJata. The leafy gametophyte, or Moss Plant, bearing 

 capsules, or sporogonia, which are the dependent sporophytc generation. (After 

 Schimper.) 



their distribution. A rough estimate of the dampness of climate in 

 a locality may even be founded on the proportion of the Bryophyta 

 in its Flora. 



