CHRISTENSEN, ON SOME SPECIES OF FERNS. 25 
Hymenophyllum peltatum (Poir.) Desv. 
Syn. H. Wilsoni Hook. et auctt. 
This is generally considered a common species jn tempe- 
rate South-America, and Dr. SKOTTSBERG has collected a se- 
ries of specimens from different localities, which without 
more careful examination could be referred to H. peltatum. 
By studying the different forms collected I have found at 
least two species present, H. peltatum and H. falklandicum 
Bak., but it must be confessed that these two species are 
very closely allied, and there remains a number of small spe- 
cimens which I have failed to determine definitely. I am 
inclined to believe that they all belong to the latter species 
if not to H. Menziesii Presl, Hym. 51, which is generally re- 
ferred as a synonym to ZH. peltatum. Among the specimens 
I refer to H. peltatum, the most interesting is one from 
Juan Fernandez: Masafuera, heath above 1000 m. 27. 
8. 1908, as the species was hitherto unknown in the islands. 
Hymenophylium falklandicum Bak. Syn. Fil. 68. 
Syn. H. caespitosum Christ apud Dusty, Svensk Exp. 
till Magellansländerna Wissensch. Ergebnisse 3: 242. 1899; 
H. glebarium Christ in C. Chr. Ind. 362. 
To this species I refer the majority of the small Hyme- 
nophylla collected by Dr. SKOTTSBERG. It differs from H. 
peltatum by 1) its wingless or wery slightly winged stipe and 
rachis, 2) only two or more rarely three lobes to a pinna, 
the margins remotely but long spinoso-dentate, 3) its stalked 
sori with very long valves. — The rachis is commonly zig- 
zag and narrowly margined above. The most developed form 
is that figured in fig. 3, a—d, but generally the leaves are much 
shorter and densely caespitose. H. caespitosum Christ is such 
a form growing between mosses; the pinnas therefore become 
more erect, broadest near the apex and often imbricating 
each other. 
Falkland-Islands: West Isl., Mt. Adam, c. 700 m. 
13. 12. 1907. Weddell Isl. 28. 11. 1907. Stanley, 
Sapper Hill, 29. 10. 1907. 
