124 THE MARSH FERN TRIBE. 
ff fairly plentiful over a wide. range 
of territory. When one becomes 
acquainted with its appearance it 
is very easily distinguished from 
its congeners, but its superficial 
resemblance to the marsh and New 
York ferns is close enough to make 
trouble for the novice. 
When this species was first col- 
lected, is perhaps not known. There 
isa note in Eaton’s “ Ferns of North 
America” regarding a form of 
Thelypteris ‘with most of the veins 
simple and the lower pinnz a little 
contracted’ which is doubtless to be re- 
‘ep tton Ud ferred to this species, and Lawson seems 
to have had the same thing in mind when 
Zeya he described in the Canadian Naturalist 
his variety z¢xtermedium of Aspidium 
Thelypteris. Mr. Raynal Dodge, however, was 
first to notice its specific differences. He 
originally collected it about 1880 near Sea- 
brook, N. H., and after referring it for some 
time from Thelypteris to Noveboracense and 
back again without being satisfied of its 
identity, came to the conclusion that it was 
neither It was subsequently named szm- 
ulatum by Mr. Geo. E. Davenport. 
Aspidium stmulatum is certainly a very dis- 
tinct species, but in habit and habitat it is so 
nearly like its allies as to suggest the thought 
; that it may be a hybrid. It seems about 
Aspidium simulatun. midway between the two in everything, even as 
