GUIDE 



35. HART'S TONGUE 



Scolopendrium vulgare 



Fronds a few inches to nearly two feet long, undivided, oblong- 

 lanceolate, heart-shaped at base, fruit-dots linear, elongated. Grow- 

 ing among the fragments of limestone cliffs. Very rare. P. 1 50. 



36. VIRGINIA CHAIN FERN 



Woodwardia Virginica 



Large, fronds once-pinnate, pinnae pinnatifid, fruit-dots oblong, 

 in chain-like rows parallel and near to the midrib, confluent when 

 ripe. In swamps. P. 1 56. 



GROUP VI 



FERTILE AND STERILE FRONDS LEAF-LIKE AND USUALLY 

 SIMILAR, FRUIT-DOTS ROUND 



37. NEW YORK FERN 



Aspidium NoveboraceHse 



Usually rather tall, fronds once-pinnate, with deeply pinnatifid 

 pinnae, tapering both ways from the middle, margins of fertile 

 fronds not revolute. In woods and open meadows. P. 159. 



38. MARSH FERN 



Aspidium Thelypteris 



Usually rather tall, fronds once-pinnate, with pinnae deeply pin- 

 natifid, scarcely narrower at the base than at the middle, veins 

 forked, fertile fronds noticeable from their strongly revolute mar- 

 gins. In wet woods and open swamps. P. 160. 



39. MASSACHUSETTS FERN 



Aspidium simulatum 



Close to preceding species, rather tall, fronds once-pinnate, with 

 pinnatifid pinnas little or not at all narrowed at base, veins not 

 forked, margin of fertile frond slightly revolute. In wooded swamps. 

 P. 164. 



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