FERN FAMILY 19 



preceding two species, and near tlie margin, 

 which is sometimes reflexed when the fern grows 

 in the sun. The fruit is brown when mature, 

 late in August or in September. The indusium 

 is kidney-shaped, finely glandular, withering, 

 and persistent. 



SPINULOSE WOOD FERN. 



Aspidiu7n spiniilosum {Dryoptci-is spmulosd). 



Frond twice pinnate, the pinnae oblique to 

 the rachis, the lower pairs broadly triangular. 

 The pinnules are set obliquely to the midrib, 

 and connected by a very narrow wing. They 

 are oblong, acute, incised or deeply cut into 

 spiny-toothed lobes. The stipe is rather long 

 and somewhat chaffy. 



This fern prefers moist, rich woods, and is 

 found only occasionally. It grows from one to 

 two and one half feet high. The fronds have a 

 somewhat stiff appearance, perhaps owing to 

 their erect manner of growth. 



The fruit-dots are small and midway between 

 the midvein and margin. They mature in July. 



The indusium is smooth, round-kidney- 

 shaped, and fixed by its sinus. 



Var. intermedium (Var. intermedia). 



Frond from two to three pinnate, the pin- 

 nae oblong-lanceolate, obtuse, spreading; pin- 



