13. 



on a specimen of Carya. pecan ( a cultiyated variety) 

 groviTing close to a residence^on a side street, at 

 Starkville, the polypody occurred abundantly in 

 numerous small clumps. This is of interest since ' 

 no other Garya bore this polypody, perhaps because 

 no other offered as good a support to the fern as 

 did this pecan. 



An analysis of the data at hand indicates 

 that where the light is weak this epiphytic fern 

 is restricted to no definite exposure; it occurs 



Of 



novi on the north side, novf on the south-east side 



and frequently on the west side of the tree,On 

 one tree it is very close to the ground, on another 

 somewhat higher, while on some trees it gets far 

 above the ground. On the other hand, where the lign t 

 is intensQthe polypody is either not present at 

 all or when it does occur it is found only on the 

 north side of the tree, It appears, therefore, that 

 the light plays an important role in the distribution 

 of the epiphyte, That the light is not jrhe only 

 factor affecting the occurrence of Polypodium 

 polypodioides as an epiphyte is evident from the 

 fact that even when such trees as Pinus echlnatsy 

 ^inus taeda, and Carya ovata are exposed to weak 

 light, they do not bear the fern. 



