FERNERIES OUT OF DOORS. 6l 



The writer has endeavored to ascertain, by cor- 

 respondence with persons interested in this branch 

 of the subject, to what extent ferns are cultivated 

 in various parts of the country. The results of 

 this are hardly as satisfactory as could be wished. 

 It appears to be the fact, that there are as yet com- 

 paratively few who have cultivated ferns for a suf- 

 ficient length of time to enable them to give any 

 definite information. The principal out-door col- 

 lections are at the North, chiefly in New England, 

 where the limit of the number of species which 

 may be cultivated can be pretty definitely deter- 

 mined. 



The following lists are arranged to aid beginners 

 who may desire to cultivate our native species of 

 ferns : 



List of North-American Ferns which are perfectly 

 hardy in the United States and Canada. 



Polypodium vulgare, LINN. Aspidium spinulosum, 



Pteris aquilina, LINN. SWARTZ. 



Adiantum pedatum, LINN. Aspidium spinulosum, var. in- 

 Woodwardia Virginica, SMITH, termedium, WILLD. 



Wocdwardia angustifolia, Aspidium spinulosum, var. di- 



SMITH. latatum, GRAY. 



Asplenium Trichomanes, Aspidium spinulosum, var. 



LINN. Boottii, GRAY. 



Asplenium ebeneum, AITON. Aspidium cristatum, SWARTZ. 



Asplenium angustifolium, Aspidium cristatum, var. Clin- 



MICHX. tonianum, D. C. EATON. 



