50 NEW YORK STATE MUSEUM 



Dryopteris thelypteris (L.) Cxrav 

 Aspidium thelypteris Sw. 

 Marsh shield fern 

 Swamps and low grounds. Common. Summer. 



Dryopteris cristata (L.) Gray 

 Aspidium cristatum Sw. 

 Crested shield fern 

 Swamps. Common. July- August. 



Dryopteris cristata clintoniana (D. C. Eaton) T^ndeiw. 

 Aspidium cristatum clintonianum (I). C. Eaton) 



Underw. 

 Wet woods. Kare. August. 



Dryopteris marginalis (L.) Gray 

 A s p i d i u m marginale Sw. 

 Marginal shield fern 

 Rocky banks in deep shade. Common. July- August. 



Dryopteris spinulosa (Retz) Kuntze 

 Aspidium spinulosum (Sw.) Kuntze 

 Spinulose shield fern 

 Wet woods and swamps. Infrequent. 



Dryopteris spinulosa intermedia (Muhl.) Underw. 

 Aspidium spinulosum var. intermedium D. C. Eaton 

 In woods wet or dry. Common. August- September. 



Dryopteris boottii (Tuckm.) I^nderw. 

 Aspidium boottii Tuckm. 

 Boott's shield fern 

 Swamps. Rare. Barton. July-September. 



Phegopteris phegopteris (L.) Fnderw. 

 P. polypodioides Fee 

 Long 'beech fern 

 Rich woods. Frequent. August. 



Phegopteris hexagonoptera (Michx.) Fee 

 Broad 'beech fern 

 Rich woods. Frequent. August. ^ 



