i6 FERNS AND THEIR ALLIES 



July. The indusium is minute, kidney-shaped, 

 with glandular margin, and is fixed by its sinus. 



DODGE'S FERN (MASSACHUSETTS FERN). 



Aspidium simulatiDii (Dryopteris simulata). 



Frond pinnate, the pinna; deeply cut into ob- 

 long, obtuse, entire, or slightly toothed lobes. 



The fern is delicate in texture and downy- 

 hairy in all its parts, especially along the mid- 

 veins. The margin of the lobes has a few coarser 

 hairs. The stipe is slightly chaffy at the base. 



It bears some resemblance to the New York 

 Fern, but can be identified readily by its form, 

 which is a trifle narroivcr at the base than in 

 the middle. In this and many other respects 

 it is very similar to the Marsh Fern. But two 

 points will aid in its determination. The pinnae 

 are usually broadest in the middle, and the veins 

 are siiiiple. 



The fronds grow singly or sometimes in 

 clusters, and are from one to nearly three feet 

 high. 



This fern prefers cool, woodland swamps. It 

 is rare in northern New England, and not com- 

 mon in the southern part. 



The sterile fronds appear first, much shorter, 

 but similar in form to the fertile ones which 

 come up late in the season. 



The fruit-dots are distinct, larger than in the 



