1 54 ciiiusT. 



l'n'sl lias (lescribed many of tlic spccie.s represented in (himinf/s eol- 

 lection* in a masterly nianner, biit perhaps has carried the separation 

 of species a littlc too far in somc cases, altliough his obscrvations are very 

 exact and his dcscriptions vcry clear. In working on Philippine ferns,, 

 it is always necessary to consnlt this worlv in detemiining whether or not 

 a species has been described. 



HYMENOPHYLLUM Smith. 



1. Hymenophyllum Merrillii n. sp. 



Leptocionium, ex afhnitate II. holochili (v. d. B.) C. Chr., Javanici, 

 caespitosum, minus, laciniis breviorilms, colore atrofusco, textura crassiore: 



Ehizomate filiformi repente caespitoso, cum stipite rhacliique pilis 

 rufis brevibus parce vestito, stipite filifornii 3 cm. longo, fronde ovata 

 acuminata vcrsus basin attenuata 6 cm. longa, 2 cm. lata, Inpinnatifida, 

 pinnis confcrtis ca. 8 utrinque, cuneato-ovatis anticc acutis sessilibus nec 

 adnatis infimis petiolulatis 6 mm. latis profunde pinnatifidis, segmentis 

 cuneato-obtusis 3 utrinquc, profunde laciniatis, laciniis lanceolatis 2 

 mm. latis scrrulato-dcntatis planis, rhachi haud alata, soris infiraae 

 laciniae antcriori pinnarum insidcntibus, pro pinna solitariis, 3 aut 4 

 utroque rhaclicos latcre, ovatis, 2.5 mm. longis, apiee bivalvatis ser- 

 rulatis, rcccptaculo crasso valde exserto. Colore atrofusco. Textura 

 rigidiuscula. 



LuzoN, Province of Pampanga, Mount Aiayat (3927 Merrill) October, 1904; 

 Province of Bataan, Mount Mariveles (Loher) Marcli, 1897, alt. 1,400 m. 



2. Hymenophyllum serrulatum (Presl) C. Chr. Ind. 3G7 (//. Smithii Hook. 

 Sp. Fil. 1: 97. Tah. 35 B). 



A species peculiar in the section Leptocionium by the valves of tlie sori being 

 entire or very slightly dentate. A large species with ovate fronds 13 cm. long, 

 7 cm. broad, the stipes 8 cm. hmg. It appears to be one of the most widely 

 distributed species of the genus in tlie Pliilippines. 



LuzoN, Province of Bataan, Mount Mariveles (3233 Mcrrill) October, 1903; 

 (165, 443, Whitford) May, July, 1904; (208 Copclaml) 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. Hosc) ; the plant reported 

 from Celebes under this name is doubtful. 



3. Hymenophyllum thuidium Harringt. in Journ. Linn. Soc. Bot. 16 (1877) 

 26; Christ in Schum. und Lauterb. Nachtr. Fl. Deutscii. Scliutsgeb. Siidsee 1 : 34. 



A large very elegant species, all tlie foliaceous parts finely crisped and at the 

 sanie time dentate-aristate. Very diaphanous, the sori sniall, globose, darlv brown, 

 terminal, the valves entire. Stipe 6 cm. long; frond 10 cm. long, 5 cm. wide. 



MiNDANAO, vSan Ramon at 800 m. alt. (1751 Copeland) April, 1905; Mount 

 Apo, at 1,800 m. alt. (1441 Copcland) October, 1905. 



Very nearly the same species is found in the Bismark Mountains, German New 

 Guinea, leg Schlechter 14030, wliich I have called H. Bismarkianum. 



■* Epimeliae botanicae (1849). 



