FLORA OF BERKSHIRE COUNTY, MASSACHUSETTS. 
PTERIDOPHYTA. FERNS AND FERN ALLIES. 
POLYPODIACEAE. FERN FAMILY. 
ADIANTUM. Maidexhair. 
A. pedatum L. Maidenhair. — Rich woods; common. On the 
slopes of the plateau to L500 feet; on the slopes of Greylock to 2000 
feet. 
ASPLENIUM. Spleenwort. 
X A. ebenoides R. R. Scott. — A hybrid between Asplenium 
platyncuron and Camptosorus rhizophyllus. First reported from 
Berkshire Co. by IVIrs. 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 (\Vest Stockbridge). Rare on the plateau; Washington 
(C. S. Lewis). 
forma serratum (E. S. IVIillor), comb. nov. — (A. platyneuron, var. 
scrratum E. S. Miller, 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; Shcllicld. 
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 M:vn. cd. 7 ami 111. V\. cd. '2 in part; 
lid. Rhodora, 19: 170, l'.»17.) 
A. acrostichoides (Sw.) Diels. Silvery Spleenwort. — (Athy- 
rinin tficlyptiwidcs 111. Fl. ed. 2.) 
