FLORA OF BERKSHIRE COUNTY, MASSACHUSETTS. 



PTERIDOPHYTA. FERNS AND FERN ALLIES. 



POLYPODIACEAE. FERN FAMILY. 



ADIANTUM. Maidenhair. 



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

 slopes of the plateau to 1.500 feet; on the slopes of Greylock to 2000 

 feet. 



ASPLENIUM. Spleenwort. 



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

 plaiy7)curon and Camptosorus rhizophyllus. First reported from 

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

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

 plants were subsequently found 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 (West Stockbridge). Rare on the plateau; Washington 

 (C. S. Lewis). 



forma serratum (E. S. Miller), comb. nov. — (.4. jAatyneuron, var. 

 serrahm E. S. IMiller, Bull. 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; Shcnicld. 



A. Trichomanes L. Maidknilviu Spleexwokt. — On or near 

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

 Washington and Becket (C. S. Lewis). 



ATHYRIUM. 



{Asplenium Man. rd. 7 and 111. V\. cd. J in part; 

 lid. Rhodora, 19: 170, 1917.) 



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

 rnim thclypieroidcs III. Fl. ed. 2.) 



