76 PHEGOPTERIS 



OAK FERN: Phegoptens Dryopteris. 



Fronds usually less than one foot liighj, smooth, 

 broadly triangular in outline, the three principal 

 divisions triangular, stalked, and widely spreading, 

 quite resembling the bracken in miniature. The 

 middle division of the frond is slightly the largest, 

 and the lower pinnules of the side divisions are the 

 longest; stipes slender. 



Fruit dots small, round, without indusia, borne 

 near the margins of the lobes. 



Found in moist, rock}^ woods from Newfoundland 

 to Virginia. 



LIMESTONE POLYPODY: 



Phegopteris Robertiana. 

 (P. calcarea.) 



Fronds 8 to 18 inches long, similar in form to 

 those of the oak fern, but are minutely glandular, 

 and the terminal division is much larger than the 

 two side divisions. 



Fruit dots small, round, without indusia, borne 

 near the margins of the lobes. 



Found on shaded limestone from Labrador to 

 Quebec, Iowa, Minnesota and Manitoba; rare. 



