sprciLTOTUM FiLicuM piiilippinionsium:. 159 
LEPTOCHILUS Kaiilfuss. 
23, Leptochilus heteroclitus (Presl) C. Chr. Tnd. Fil. (1905) 11, 385. 
Acrostichutn flagelliferuin Wall. 
Tliis species, widely distributed from Britiali India, tliroxighout Malaya, and 
in the Philippines especially, offers in the latter roj^ion a variability that ap- 
proaches that of Biyoptcris cancscens. The apices of ilie sterile leaves are elon- 
gated into linear lash-like appendages -vvhieh are proliferous and usually take root, 
the young plants omitting a fascicle of leaves entirely different from those of 
the adult ones. Often they are not simple linear leaves, -with the lateral lol>es 
more or less aborted, but frequently are singulavli' compound, enlarged and deeply 
incised. Often the little plants are fertile, and the fertile fronds offer irregular- 
ities analagous to the sterile ones. In other characters the diiferences are 
frequently strongly marked, and the various forms might readily be considered 
to represent distinct species. I have enumerated below the forms, (hat in my 
conception of this species, should he considered as varieties or subspecies, and 
although several of them have acquired a certain stability, certain characters are 
constant in all of them, showing their close relationship to L. heteroclitus and 
probable derivation from that species. 
\ 
Var. eupybasis n. var. 
Ehizomate repcntc, pennac anscrinac erassitic, cum stipite basi squamis 
mimitis dilute bnmneis crispis sparso radicoso. Foliis sparsis sed appro- 
pinqiiatis, foliorum sterilinm stipite 8 cm. longo flexuoso tenui griseo, 
fronde 13 cm. longo deltoideo-ovata^ pinna tcrminali decurrcnte et cum 
pinna laterali proxima parva plus minus concrota, basi cunoata, acumi- 
nata, nee caudata noc prolifera, 8 em. longa, 2.5 cm. lata oblonga par- 
viloba, lobis 10 vel pluribus utrinque subrotundis 3 mm. latis acute 
denticulatis, pinnis lateralibus 3 aut 4 utrinque, mediis 3 cm. longis, 1 
cm. latis cuneatis obtusis decurrentibus serrato-lobulatis, infimis valde 
postice auetis deltoideo-ovatis petiolatis nee decurrentibus, basi profunde 
incisis, caeterum serrato-lobatis. IS^'ervis lateralibus rectis a costa ad 
margincm protensis 4 mm. distantibus, series plures areolamm valde 
irregulariamm, minores areolas nee nervulos liberos includentiuni con- 
tinentibus. Colore atrato, textura herbacea, opaca. Foliorum fertilium 
lamina acquilonga scd angustiore, pinna tcrminali n cm, longa lanceolata 
acuta profunde lobata dceurrente, pinnis lateralibus 4 utrinque obtusis, 
2.5 cm. longis, 1.5 cm. latis, ovatis sessilibus aut adnati-s sed pinnis infimis 
petiolatis auetis, paric tcrminali late cuneato-ovatn lol)ata, pinnulis late- 
ralibus similibus minoribus. 
Mindanao, Lake Lanao, Camp Keithley (552 Mrs. Clemens) May, 1006, alt. 
GGO m. , . . . , li • 1 
Differing from the type by its aberrent fronds being m part hipinnate, deltoid 
at the enlarged base, posteriorly deeply incised; even the fertile fronds are some- 
times hipinnate at the base. 
