154 NEW YORK STATE MUSEUM 



Pteris aquilina Z. 

 Brake. Bracken 

 Thin woods and open places, mostly in dry soil. Common. 



Asplenium acrostichoides Sw. 



A. thelyfteroides Mx. 

 Silvery spleenwort 

 Damp or wet places in woods. Wood's sap works. 



Asplenium Filix-foemina (Z.) Bernh. 



Lady fern 



f 



Woods and roadsides. Common. The form with narrow fronds 

 occurs occasionally. It is sometimes recognized as a variety under the 

 name A. Filix-foemina angustum (Willd.) 



Dryopteris Thelypteris {L.) Gray 

 Aspidium Thelypteris Sw. 

 Marsh shield fern 

 Swamps and wet places. Common. 



Dryopteris Noveboracensis (Z.) Gray 



Aspidium Noveboracense Sw. 



New York fern 



Swamps and wet places. Common. Resembling the last species but 

 having more delicate fronds with the lower pinnae gradually shorter and 

 the veins of the segments simple. 



Dryopteris spinulosa {Retz.) Kuntze 



Aspidium spinulosum Sw. 



Spinulose shield fern 



On and near the top of Mt Mclntyre. In the Adirondacks the 



typical form of the species is found in more elevated places than the 



variety. 



D. spinulosa intermedia {Mnhl.) Undei'w. 



Aspidium spinulosum var. intermedium D. C. Eaton 



Woods. The most abundant form of the species. 



