Asplenium POLYPODIACEAE Polystichum 



A. platyneuron (L.) Oakes. {A. eheneum Ait.) Ebony Spleen- 

 wort. 



Common throughout, on grassy banks and in open pine woods. 

 A. Trichomanes L. Maidenhair Spleenwort. 



Rare, in moist rock-crevices along the Brandywine and Red 

 Clay Creeks (NC). Not collected since 1893. 



Athyrium Roth. {Asplenium L.) 



A. thelypteroides (Mx.) Desv. (Asplenium acrostichoides Sw.) 

 Silvery Spleenwort. 



Frequent, in ditches and moist sandy woods. 



A. asplenioides (Mx.) Desv. Lowland or Southern Lady-fern. 



Frequent throughout, in wet woods and thickets, and on banks 

 of streams. 



A. angustum (Willd.) Presl. Upland or Northern Lady-fern. 



In the same habitats as the preceding species, but less common. 



This species and the last preceding one seem to have roughly the 

 same distribution in our area, both of them occurring in both Pied- 

 mont and Coastal Plain. There is much intergrading, so that it is 

 often difficult to separate the species. Some writers prefer to re- 

 gard them as merely extreme forms of a single species, A. Filix- 

 foemina (L.) Bernh, 



Camptosorus Link. Walking Fern. 



C. rhizophyllus (L.) Link. 



Rare, on wooded rocky slopes of the Piedmont: Mt. Cuba 

 (NC), Commons, July 1865 (A); near Centreville (NC), Commons, 

 13 June 1877 (A); woods above Rowlandsville (Ce), Long & 

 Bartram, 31 May 1913 (A); Conowingo (Ce), Fogg, 30 May 1926 

 (P) ; high up the rocky slope, along east side of Brandywine Creek 

 above Rockland (NC), (Charles R. Tatnall), R. R. Tatnall, 232, 24 

 March 1929 (T) ; near foot of rocky slope, just above deep railway 

 cut, }/2 mi. n. of Mt. Cuba, about 40 feet from track, R. R. Tatnall, 

 1195, 27 June 1931 (T) ; same as last, but about 25 feet from track, 

 R. R. Tatnall, 5004, 17 April 1942 (T). 



Polystichum Roth. 

 P. acrostichoides (Mx.) Schott. Christmas Fern. 



Woods, ravines and stream banks, in rocky, sandy or rich soil, 



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