American Fern Journal 
Vol. 1 JULY 1911 No. 5 
The tropical American species of Dryopteris 
_ subgenus Eudryopteris 
CARL CHRISTENSEN 
While most of the species of Dryopteris occurring in 
the north temperate regions | belong to the subgenus 
: _ Eudryopteris, this subgenus is rather poorly represented 
in the tropies. The subgenus is in this paper delimited 
to include only the species belonging to the group of D. 
filix mas, and confined thus it is a most natural group, 
no doubt worthy of generic rank (Dryopteris proper), and 
not much related to the other groups of the genus. 
Eudryopteris: as understood here is not to be confounded 
with the subgenus Eudryopteris of my Index Filieum. 
In a larger paper soon to be issued I shall give the char- 
acters of the different subgenera of Dryopteris, while 
here I intend to mention briefly some of the spores: = oe 
Eudry paste from tropical America. 
Till n 
. I know only 10 species. from ae whole oe S| 
tropical gaa which all but one grow in Mexico. : The : oo 
rich fern localities, Jamaica and southern | Brazil, have i 
only two species each, the same two, D. paleacea and i D. 
patula, and the South American Andes have, | : 
=. = one ‘more, ; dD. Sapo, described below. 
distri ibuted 
