57 
Besides the type-specimens I have had for examination the whole material of 
the species dealt with, that is contained in the museums of Copenhagen, Stock- 
holm, Berlin, Washington, Herb. PnEsr, and the large collections in Herb. 
Rosenstock and Herb. Curist. Dr. Curist’s very valuable collection of ferns is 
now incorporated in Herb. Rorawp Bonaparte, Paris. Smaller collections I have 
received from Prince BONAPARTE, the museums of Lund, Bruxelles, München 
and Vienna. 
To the curators of the museums enumerated above I owe my most sincere 
thanks for the kindness they have shown to me by lending me such comprehen- 
sive collections for study. My special thanks I must convey to His Highness, 
Prince RorANp BoNaPARTE, for the great aid I received during my sojourn in 
Paris, to Dr. H. Curist and Dr. E. RosENsTOCK for numerous courtesies, to Miss 
ManGARET SLossoN, New York, and to Mr. W. R. Maxon, Washington, for his most 
valuable assistance by sending to me the very comprehensive collections from Cen- 
tral America and the West Indies contained in the U. S. National Herbarium. 
These collections, consisting nearly exclusively of specimens collected during the 
last twenty years, f. inst. the large collection gathered in Central America by J. 
DonNELL SwrrH and his collectors, are very rich in beautiful and complete spe- 
cimens. 
Finally I beg Dr. C. H. OsTENFELD, curator of the Botanical Museum, Copen- 
hagen, accept my best thanks for his never failing benevolence, without which I 
scarcely should have got such a large material for examination. 
Under each species I quote the specimens seen by me, indicating in a paren- 
thesis where the specimen is to be found. The letters in parenthesis mean: 
B — Herbarium Berolinense, Berlin. 
RB — Herb. Roland Bonaparte, Paris. 
C — Herb. H. Christ, now in Herb. Bonaparte. 
CC — Herb. Carl Christensen, Copenhagen. 
H — Herb. Hauniense, Copenhagen. 
Kew — Royal Botanic Gardens, Kew. 
L — Herb. Lundense, Lund. 
R = Herb. E. Rosenstock, Gotha. 
Rg — Herb. Regnellianum, Stockholm. 
S = Herb. Holmiense, Stockholm. 
W = U. S. National Herbarium, Washington. 
The 46 figures, illustrating 88 species, are about all illustrations of type-spe- 
cimens and show, as a rule, a pinna reduced to ‘/s of its natural size, and two or 
three segments enlarged 1!/». 
