154 
CHRIST. 
Presl has described many of the species represented in Owning’s col- 
lection 4 in a masterly manner, bnt perhaps has carried the separation 
of species a little too far in some cases, although his observations are very 
exact and his descriptions very clear. In working on Philippine ferns, 
it is always necessary to consult this work in determining whether or not 
a species has been described. 
HYMENOPHYLLUM Smith. 
1. Hymenophyllum Merrillii n. sp. 
Leptocionium, ex affinitate II . liolockili (v. d. B.) C. Chr., Javanici, 
caespitosum, minus, laciniis brevioribus, colore atrofusco, textura crassiore. 
Rhizomate filifornii repente caespitoso, cum stipite rhachique pilis 
rufis brevibus parce vestito, stipite filiformi 3 cm. longo, fronde ovata 
acuminata versus basin attenuata 6 cm. longa, 2 cm. lata, bipinnatifida, 
pinnis confertis ca. 8 utrinque, cuneato-ovatis antice acutis sessilibus nec 
adnatis infimis petiolulatis 6 mm. latis profunde pinnatifidis, segmentis 
cuneato-obtusis 3 utrinque, profunde laciniatis, laciniis lanceolatis 2 
mm. latis serrulato-dentatis planis, rhachi haud alata, soris infimae 
laciniae anteriori pinnarum insidentibus 0 pro pinna solitariis, 3 aut 4 
utroque rhacheos latere, ovatis, 2.5 mm. longis, apice bivalvatis ser- 
rulatis, receptaculo crasso valde exserto. Colore atrofusco. Textura 
rigidiuscula. 
Luzon, Province of Pampanga, Mount Arayat (3927 Merrill) October, 1904; 
Province of Bataan, Mount Mariveles (Loher) March, 1897, alt. 1,400 m. 
2. Hymenophyllum serrulatum (Presl) C. Chr. Ind. 367 (H. Smithii Hook. 
Sp. Fil. 1 : 97. Tab. 35 B) . 
A species peculiar in the section Leptocionium by the valves of the sori being 
entire or very slightly dentate. A large species with ovate fronds 13 cm. long, 
7 cm. broad, the stipes 8 cm. long. It appears to be one of the most widely 
distributed species of the genus in the Philippines. 
Luzon, Province of Bataan, Mount Mariveles (3233 Merrill) October, 1903; 
(165, 443, Whitford) May, July, 1904; (208 Copeland) January, 1904; Province 
of Tayabas, Mount Banajao (918 Whitford) October, 1904; Province of Rizal, 
Angilog (Loher) March, 1906. Negros, Mount Silay (1509 Whitford) May, 1906. 
The same species has been found in Perak (leg. Hose) ; the plant reported 
from Celebes under this name is doubtful. 
3. Hymenophyllum thuldium Harringt. in Journ. Linn. Soc. Bot. 16 (1877) 
26; Christ in Schum. und Lauterb. Nachtr. FI. Deutseli. Scliutsgeb. Siidsee 1 34. 
A large very elegant species, - all the foliaceous parts finely crisped and at the' 
same time dentate-aristate. Very diaphanous, the sori small, globose, dark brown, 
terminal, the valves entire. Stipe 6 cm. long; frond 10 cm. long, 5 cm. wide. 
Mindanao, San Ramon at 800 m. alt. (1751 Copeland) April, 1905; Mount 
Apo, at 1,800 m. alt. (1441 Copeland) October, 1905. 
Very nearly the same species is found in the Bismark Mountains, German New 
Guinea, leg Sohlechter 14030, which I have called H. BismarJcianum. 
4 Epimeliae botanicae ( 1849 ) . 
