—na- 

 tions, it does not require a damp or even a moist location. 

 At the bases of the cliffs where streams run, it does not 

 grow. 



The prothallia I found to be most abundant some three 

 feet down clefts in the limestone ridges, where it was 

 moist and half darjc. The largest fronds I found were 



13 inches long, and the average length of fronds was 

 10 inches. Throughout this region it exhibits none of 

 the great tendency to vary which characterizes it in many 

 localities. Of the thousands of plants I examined only 

 two showed any variation, one bore a frond which was 

 slightly forked at the tip, the other a frond with a very 

 irregular outline and a blunt, rounded tip. The indusia 



