OLYPODIACEAE. 



425 



1. Dryopteris normalis C. Christen- 

 sen. LARGER MARSH SHIELD-FERN. (Fig. 

 463.) Rootstocks horizontal. Leaves sev- 

 eral together, the blades oblong, l-4 

 long, softly pubescent beneath; pinnae 

 linear, acuminate, cleft three-fourths the 

 way to the midrib; segments numerous, 

 the basal ones longest; veinlets manifest, 

 unforked, the lowest ones of adjacent 

 segments often uniting; sori near the 

 margins; indusia pubescent. [Aspidium 

 patens and Nephrodium patens of pre- 

 vious authors, not Aspidium patens Sw.] 



Common in marshes and occasional on 

 shaded hillsides. Native. Florida, West 

 Indies. 



Dryopteris mollis [Aspidium molle Sw. ; Nephrodium molle Desv.], ad- 

 mitted as Bermudan by Eeade, by Jones, and by Hemsley, is recorded by 

 Lefroy as planted out by him about 1875. There is no evidence that it ever 

 grew naturally in Bermuda. 



2. Dryopteris Thelypteris (L.) A. 

 Gray. MARSH SHIELD-FERN. (Fig. 464.) 

 Eootstocks slender, creeping. Leaves 

 erect ; blades oblong-lanceolate, scarcely 

 narrower at the base than at the middle, 

 l-3 long, short-acuminate, membra- 

 nous, pinnate; pinnae linear-lanceolate, 

 short-stalked or sessile, mostly horizon- 

 tal, acuminate at the apex, nearly trun- 

 cate at the base, Y-1V long, slightly 

 pubescent beneath, deeply pinnatifid ; 

 segments oblong, obtuse, or appearing 

 acute from the strongly revolute mar- 

 gins, the veins regularly once or twice 

 forked; ?ori crowded, 10-12 to each seg- 

 ment; indusia reniform, slightly glandu- 

 lar, or glabrous. [Acrostichum Thelyp- 

 teris L. ; Aspidium Thelypteris Sw.] 



Frequent in fresh-water marshes. Native. Temperate North America and 

 Europe. 



