HYMENOPHYLLACE.E. 257 



bipinnatifida, segmentis I. mediis vel inferioribus longissirnis, infiinis brevioribus 

 superioribus gradatim brevioribus minoribus, mediis oblongis 3cm. longis l^cm. 

 latis apice obtusis basi latissimis latere superiore truncatis latere inferiore cunea- 

 tis, segmentis II. infimis mediis obovato-cuneatis apice obtusissimis basi cuneatis 

 8-9 mm. longis 5mm. latis pinnatis, lobis linearibus apice obtusis 3-4 mm. longis 

 1mm. latis; textura tenuissime membranacea glabra semihyalina ; rhachis alata, 

 cum alis 2 mm. lata, alis mm. latis valde undulato-crispatis ; rhachis segmen- 

 torum I. alata cum alis 2 mm. lata, alis partibus inferioribus undulato-crispis ; 

 segmentis inferioribus I. a se circ. 1^-2 cm. remotis, segmentis inferioribus II. 

 5-6 mm. a se remotis. Sori ad latus superius partis basilaris segmentorum 

 I. vel II. siti breve stipitati, stipitibus apice constrictis ; involucrum perfecte 

 bivalvatum oblongo-rotundatum margine denticulatum. 



HymenopJiyllum javanicum HAYATA Ic. PL Formos. IV. p. 141, fig. 81, (non 

 SPRENG). 



HAB. Mt. Arisan, leg. B. HAYATA et S. SASAKI ; inter Heishana et Niman- 

 daira, leg. B. HAYATA et TAKEO ITO, Mart. 1914. 



Differs from HymenopJiyllum javanicum SPRENG by the much narrower and 

 longer fronds with sori usually situated at the basal portions of the pinnse. 

 Somewhat allied to H. crispatum (Hk. et GRIF. t. 77) by the crispate wings of 

 the stipes ; but widely different from it by the lanceolate fronds with truncate 

 valves of the involucres. When I found the fern in January 1912, it was of a 

 rather contracted form, attaining not more than 14 cm. in length ; but in 

 March 1914, I saw the same fern very much elongate, exceeding twice as long 

 as before, but very much narrower. 



Hymenophyllum crispato-alatum HAYATA form, remotipinnum Khi- 

 zoma repens gracillimum remotissime frondigerum. Stipes 6-10 cm. longus gra- 

 cillimus a medio sursum alatus sursurn cum alis 2mm. latus. Frons lanceolata 

 15cm.-23cm. longa 3-4 cm. lata apice acuminata basi abrupte truncata apice 

 gradatim acuminatissima bi- vel tripinnatifida, segmentis I. mediis longissimis 

 4^ cm. longis 1 cm. latis lineari-lanceolatis a se 1^ cm. remotis, segmentis II. 

 oblique obovatis vel linearibus 7mm. longis latere superiore 1-3-lobatis latere 

 inferiore elobatis, lobis linearibus obtusis 1 mm. latis, segmentis II. a se 5 mm. 

 remotis ; segmentis I. et segmentis II. a rhachibus angulo 45 agressis ; rhachis 



