ADDER'S-TONGUE FAMILY 119 



Botrychium ternatum rutcBfoUum {Botrychimn matn- 

 carice). 



The sterile portion is small, but bears much re- 

 semblance to van obliquuni. The ultimate seg- 

 ments are few, ovate and somewhat heart-shaped. 



This is rarely found ; it grows in old fields. 



The fertile portion is similar to that of the 

 preceding varieties. 



LITTLE GRAPE FERN. 



Botrychium simp/ex. 



Plant from two to five inches high, the ster- 

 ile portion short-stalked from near the middle 

 of the common stem. The sterile portion is 

 simple, or pinnately parted into three or more 

 roundish lobes. It is fleshy in texture, and rather 

 thick. This is a rare little fern, growing in 

 moist, hilly pastures and open woods. 



The fertile portion is taller than the sterile, 

 and is once or twice pinnate, with double rows 

 of sessile, distinct, naked sporangia which ma- 

 ture in May or June. 



MATRICARY GRAPE FERN. 



Botrychium matricariafoHum. 

 This fern is also termed B. ncglcctinn. 

 The sterile portion is sessile or nearly so, 

 placed above the middle of the common stalk. 



