Flora of the Allegany State Park Region 21 



Division 1 PTERIDOPHYTA 

 POLYPODIACEAE (Fern Family) 



Cystopteris fragilis (L.) Bernh. Brittle Fern 



Uncommon or rare and confined chiefly to moist 

 rocky situations. Rocks above north side of Quaker 

 run. 

 Pteretis nodulosa (Michx.) Nieuwl., Onoclea Struthi- 

 opteris, Gray's Man., See Am. Midland Nat. 

 4: 334. 1916. Ostrich Fern 

 In moist alluvial soil of open woods and thickets 

 along the Allegheny and Tunungwant valleys. In- 

 frequent. 

 Onoclea sensibilis L. Sensitive Fern 



In moist or wet soil of open places, thickets and 

 thin woods along most of the stream courses and in 

 swamps and marshes. Common. 

 Thelypteris Dryopteris (L.) Slosson, Phcgopteris 

 Dryopteris, Gray's Man. Oak Fern 

 In moist fertile humus of ravines and shaded 

 woods and thickets, shaded mossy rocks and sphag- 

 num swamps. Rare. Found by Frank W. Johnson 

 on Coon run and upper Quaker run. 



The generic name Thelypteris, in place of either 



Aspidium or Dryopteris, is adopted here, see Nieuw- 



land, Am. Midland Nat. 1 : 226. 1910, and to it is 



united the genus Phcgopteris, see Weatherby, Rho- 



dora 21: 179. 1919. 



Thelypteris hexagonoptera (Michx.) Weatherby, 



Phcgopteris hexagonoptera Fee. Broad Beech 



Fern 



In sterile soil, usually gravelly or sandy, in open 



woods, thickets and on banks, frequent on or ad- 



