24 FERNS AND THEIR ALLIES 



This fern was formerly considered a variety 

 of the Spinulose Wood Fern, and somewhat re- 

 sembles var. intermedium, but it can be deter- 

 mined by the form of the frond, which nai-rows 

 somewhat at the base, also by the pinnules, 

 which are less deeply ctU. 



It is noticeable for the erect growth of the 

 fronds, which are from one to two and one half 

 feet high. 



It is found in wet thickets and about ponds 

 frequently. 



The sterile fronds are usually smaller than 

 the fertile ones, and are evergreen. 



The fruit-dots are large ; they mature in July. 

 The indusium is minutely glandular, round- 

 kidney-shaped, and fixed by its sinus. 



MARGINAL SHIELD FERN. 



Aspidinni marginak {Dryopteris marginalis). 



Frond twice pinnate, the pinna: lanceolate, 

 broadest a little above the base. The pinnules 

 are oblong-scythe-shaped, obtuse or pointed, 

 entire, crenately toothed, or occasionally deeply 

 cut, the upper ones becoming confluent at the 

 tip. The stipe and rachis are channeled, and, 

 in large fronds, the midribs of the pinnae. The 

 stipe is very chaffy. 



This is a well-preserved evergreen fern, and 

 is sometimes called the Evergreen Wood Fern. 



