217 269 
not a few of the forms in Ind. Fil. referred to D. reticulata being valid species. MrT- 
TENIUS (Fil. Leschl. II. 21—25) has given a review of the species known till 1859; 
and I can, as far as I know the species, fully agree with his treatment. Since 
then several species have been described, and below I describe two others as new, the 
first of these being an interesting intermediate between the true species of Meniscium 
and D. meniscioides belonging to Goniopteris. 
268. Dryopteris ensiformis n.sp. — Fig. 46. 
Type from Costa Rica: Lisiéres des pàturages à La Palma, 1459 m, leg. Ad. 
ToNwpvuz nr. 12533 (C). 
Rhizomate? Stipitibus ad basin 2cm crassis, ad 1m longis, glabris. Lamina 
visa incompleta, pinnata, omnino glabra, coriacea, brunneo-viridi. Pinnis inter se 
6 cm remotis, ensiformibus, 30—35 cm longis, ad 5 cm latis, apice caudata, basi ab- 
rupte rotundata, subcordata subsessilibus, infra aérophoro instructa (7; marginibus 
irregulariter repandulis, cartilagineis. Venis secundariis 4 mm 
circiter inter se remotis, curvalis, tertiariis simplicibus, 10—12- 
jugis, omnibus more Meniscii anastomosantibus; radiis late clavatis, 
liberis vel saepe omnibus confluentibus venam venis secundariis 
paralellam formantibus. Soris parvis, atrorufis, in venis medialibus, 
rotundis, raro confluentibus, exindusiatis. Sporangia receptaculisque 
glabris. 
This new species is a peculiar fern, in general habit a Me- 
niscium, but in venation and sori not unlike D. meniscioides, from 
which it differs by the much closer secondary and tertiary veins 
and by the subcordate base of the pinnz, which have nearly the 
same breadth from base to short of the apex. It also resembles 
D. (Meniscium/ Andreana (Sod.) C. Chr., which in sori is a true 
Meniscium. The most remarkable features of our new species are 
1) the presence of an aérophore, 2) the edges of the pinnz and 
3) the venation. Ad 1). At the insertion of the coste is to be 
found a large, blackbrown spot, which evidently is the scar of a 
fallen aérophore. Ad 2). The pinne are bordered by a broad, car- 
tilagineous line. Ad. 3). The excurrent veinlet formed by two 
anastomosing veins is always much longer than found in other 
species of Meniscium; often it reaches nearly to the next cross- 
vein and then ends in a broad clavate apex, in which a brown, Fig.46. Fragments of 
oblong pellucid spot is seen on the upperside; but often the PD e"siformis n. sp. 
veinlet is continued to the next cross-vein and the veinlets between » kr nw ur VN 
two secondary veins then together form a continued vein parallel à 
to the secondary veins. In this case the veinlets are thickened above the middle 
and enclose a brown pellucid spot as described, above which they again narrow. 




D. K. D. Vidensk. Selsk. Skr., 7. Rekke, naturvidensk. og mathem. Afd. X. 2. 35 
