FLORA OF BERKSHIRE COUNTY, MASSACHUSETTS. 



PTERIDOPHYTA. FERNS AND FERN ALLIES. 

 POLYPODIACEAE. FERN FAMILY. 



ADIANTXJM. Maidenhair. 



A. pedatum L. Maidenhair. — Rich woods; common. On the 

 slopes of the plateau to 1500 feet; on the slopes of Greylock to 2000 

 feet. 



ASPLENIUM. Spleenwort. 



X A. ebenoides R. R. Scott. — A hybrid between Asplenium 

 platyneuron and Camptosorus rhizophyllus. First reported from 

 Berkshire Co. by Mrs. J. R. Sanford {vid. Rhodora, 8: 113, 1906), 

 growing on Umestone rocks in the southern part of Sheffield. Three 

 plants were subsequently foimd by Walters in another locality in the 

 same town. 



A. platyneuron (L.) Oakes. Ebony Spleenwort. — Rocky pas- 

 tures and open rocky woods, generally at the bases of ledges; fre- 

 quent. Grows chiefly on limestone, but also on serpentine (Florida) 

 and schist (AVest Stockbridge). Rare on the plateau; Washington 

 (C. S. Leu-is). 



forma serratum (E. S. ^Miller), comb. nov. — {A. platyneuron, var. 

 serratum E. S. MiUer, BuU. Torr. Bot. Club, 4: 41, 1873.) 



Occasional with the type, Sheffield. 



A. Ruta-muraria L. Rue Spleenwort. — Limestone cliffs and 

 boulders; occasional. Williamstown ; North Adams; Lenox; Stock- 

 bridge; New Marlboro; Sheffield. 



A. Trichomanes L. ^Maidenhair Spleenwort. — On or near 

 shaded rocks, chiefly calcareous; frequent. Rare on the plateau; 

 Washington and Becket (C. S. Lewis). 



ATHYRIUM. 



{Asplenium Man. ed. 7 and El. Fl. ed. 2 in part; 

 vid. Rhodora, 19: 170, 1917.) 



A. acrostichoides (Sw.) Diels. Silvery Spleenwort.— {Athy- 

 rium thelypteroides 111. Fl. ed. 2.) 



