20 FERNS AND THEIR ALLIES 



miles crowded, pinnately parted, spiny-toothed 

 at the apex. The lowest pinna: are unequally 

 triangular-ovate in form, the pinnules being 

 considerably longer on the lower side than 

 those on the upper side. The stipe is slightly 

 chaffy. 



The fronds are from one to two and one half 

 feet long, and are evergreen, lying flat during 

 the winter. 



This is a beautiful, feathery fern, abounding 

 in woods throughout our range, being much 

 more common than the type form. 



The fruit-dots are round and small ; they 

 mature in July. The indusium is glandular. 



Var. di/a latum (Var. dilatata). 



This is a form found principally in mountain 

 woods. The frond is tripinnate, the lowest pair 

 of pinnas triangular in form, the pinnules on 

 the lower side being conspicuously elongated. It 

 can be distinguished from var. intermedium by 

 its broadly ovate outline. 



The indusium is smooth and naked. 



PURDIE'S CONCORD NEPHRODIUM. 



Aspidiitm spiiiulosum Coiicordianum {Dryopteris 

 sp!?iiilosa Concordia7ia). 



This is a fern discovered in a rich woodland 

 swamp in Concord, Massachusetts, in 1902, by 



