PHILIPPINE FERNS, IV. 
113 
are very sinuous in outline, as in “Diplazium.” In outline of frond Athyrium 
crendto-serratum. suggests Currania, but no near relative of the former has 
simple fronds. I have included in Athyrium several species with naked sori, 
but in these cases the intermediate relationships were quite clear. Currania, 
beside having no indusia, is so distinct in aspect and in various characters from 
any group in Athyrium that its generic separation seems necessary. Fresh fronds 
have a fine odor of cumarin. 
ASPLENIUM Linn. 
Asplenium epiphyticum Copel. 
Luzon, Province of Laguna, Mount Maquiling, Copeland., altitude 500 m. 
Hitherto known only from Mindanao. 
The spores are beset with long spine- or horn like projections, usually curved, 
making them look like miniature burrs. The spores of A. scolopendroides J. Sm., 
and A. trifoliatum Copel., of Borneo, are similar. I have examined the spores 
of various species of Stenochlaena, to which genus Christ 2 would reduce A. 
epiphyticum, and have found nothing at all similar, although several species 
have rough spores. I also believe this fern and Stenochlaena to be related, and 
nearly so ; but this is none the less an Asplenium for that reason. 
Asplenium tenuifolium Don Prodr. FI. Nepal. (1825) 8. 
Luzon, Province of Benguet, exact locality not stated, For. Bur. 15729 Merritt 
ct- Curran, exactly like small specimens from Sikkim; Mt. Pulog, 2,300 m. alt., 
Copeland. 
Hitherto known only from British India, including Burma. 
Asplenium gracilifolium sp. nov. 
Bhizomate breve, 1.5-2 mm crasso, paleis castaneis 2 mm longis angustis 
tenuissimis vestito; stipitibus confertis usque ad 10 cm longis, 0.8 mm 
crassis, castaneis, nitidis, primo paleis conformibus vestitis, glabrescen- 
tibus; fronde 15-25 cm alta, 2. 5-3. 5 cm lata, acuminata, bipinnata, rliachi 
deorsum castanea sursum alata et viridescente, interdum in alis pinnarum 
prolifera; pinnis stipitatis, ovatis, obtusis, glabris, herbaceis; pinnulis 
pinnarum maximarum acroscopieis 1-2, basiscopicis 1, flabellato-cuneatis, 
usque ad 8 mm longis et 6 mm latis, apice rotundatis, leviter inciso- 
crenatis, lobis obtusis; venatione laxa; soris brevibus, margine haud 
approximate, indusiis latis, pallidis. 
Luzon, Province of Laguna, Mount Banajao, Copeland 2123, epiphytic on 
mossy trunks, 1,700 to 2,250 m altitude. 
This seems to be most nearly related to Asplenium laserpitiifolium, from 
which, and from the other allied species of the same difficult group, it differs in 
the very narrow fronds. Asplenium Elmeri is more finely cut, and has the 
ultimate divisions much narrower, with longer sori. A. gracile Fee, judging 
from a specimen of Cuming’s, may be this species, although Fee’s figure, of a 
presumably juvenile form, represents the sori as longer and the teeth as sharp; 
at any rate Fee’s name is invalid. I have seen this fern only from Mount 
Banajao, but from this locality have twelve sheets of very uniform specimens. 
2 Biologishe und systematische Bedeutung des Dimorphisus und der Missbild- 
ung bei epiphytischen Farkrautern, besonders Stenochlaena. Verhandl. Sclav. 
Naturforsch. Gesellschaft (1907). 
