80. -_  AmeERICAN FeRN JouRNAL 
There is no lack of intergrading forms and this is prob- 
ably an ecological variation, but it is so at variance with 
the published descriptions that I was on the point of 
giving it a form name for purposes of reference when I 
chanced upon D. C. Eaton’s reference to ‘“‘a variety 
serratum” described by Lawson in the Canadian Natural- 
ist.* 
Lawson’s description reads:+ “8 serratum.—Lobes of 
the pinne ovate-oblong, approximate, strongly and ine 
cisely serrate. This may be regarded as a subvariety.— 
Belleville, J: Macoun.’’ 
The description of my form would read something a as 
follows: Pinne triangular-lanceolate, pinne and lobes 
‘fo phe. . , 
~The forms a are evidently alike in one importants it pe 
and the apparent difference may be partly due to inc 
_ plete description. | T have figured my Pant i in the nM 
that ck Sa ay 
to authentic specimens ‘of. variety serratum. ae 
_ There appeared in an early number of the rok 
Jetin a discussion ses Mr. = Dz Gilbert, in whieh 
3 sori straight, parallel, set closely together.””. oe 
i ee ee this article 
