6 A MANUAL OF MOSSES 



wild and rocky gorges sometimes a thousand feet or more in 

 depth. Somewhat similar and perhaps but little inferior to the 

 Ohio Pyle region are localities along the gaps cut through the 

 ridges by the Conemaugh and Loyalhanna Rivers and the 

 eastward-flowing Juniata and \Yest Branch of the Susque- 

 hanna River. 



The northeastern part of our region is an elevated table- 

 land which is so dissected as to be rather hillv in some dis- 



j 



tricts but the flora is quite northern in its character. The 

 forests were largely composed of Hemlocks, White Pines, 

 Birches, Beeches, and Maples and the moss flora is found to 

 contain a rich deA^elopment of Bryales, of which not a few are 

 absent or rare in the Oak and Chestnut forests to the south 

 and southwest. 



The total number of genera, species, and varieties 

 recognized in this Manual as having been collected or authori- 

 tatively reported in the confines of western Pennsylvania are 

 as follows, twenty-nine families being represented : 



Genera Species Varieties 



Sphagnalcs 1 14 10 



Bryales 102 234 20 



Total. 103 248 30 



