POLYPODIACE^E. 175 



apice in ambitu abrupte acuminata basi latissima quadripinnata, pinnis 

 utroque latere 8-9, infimis longissimis superioribus gradatim brevioribus ad 

 apicem ad dentem pinnae terminalis reductis, inferioribus a se 5 cm. remotis, 

 infimis 18 cm. longis triangularibus 10 cm. latis basi latere inferiore 7 cm. latis 

 latere superiore 4 cm. latis apice acuminatissimis (acumine lineari) basi petio- 

 latis (petiolis 2-3 cm. longis) pinnulis ordinis primarii infimis (latere inferiore) 

 8 cm. longis lanceolatis falcato-ascendentl-recurvis basi latissimis 3 cm. latis 

 apice acuminatissimis sub-aequilateralibus breve petiolulatis, pinnulis ordinis 

 secundarii infimis (latere inferiore) oblique triangularibus 2 cm. longis 1^ cm. 

 latis apice obtusissimis basi subtruncatis breve petiolulatis; pinnulis ordinis 

 tertii infimis (latere inferiore) oblique obovatis 1% cm. loiigis 4 mm. latis apice 



rotundato-obtusis basi cuneatis subsessilibus subunilateralibus 1-2-lobatis, lobis 



v.. 

 2 mm. longis totiusque latis obtusissimis ; pinnulis ordinis tertii infimis lateris 



superioris latioribus majoribus quam iis lateris inferioris. Rhachis frondis 

 glaberrima valde flexuosa, rhachis pinnarum minus flexuosa sursum subalata 

 complanata, rhachis pinnularum subrecta complanata subalata ; pinnis inferi- 

 oribus a se 6 cm. remotis, pinnulis ordinis primarii inferioribus a se 2 cm. 

 remotis, pinnulis ordinis secundarii inferioribus a se 1 cm. remotis, pinnulis 

 ordinis tertii inferioribus a se 5 cm. remotis, pinnis infimis a rhachibus 

 frondium angulo 140, pinnis superioribus angulo 90 divaricatis, pinnulis a 

 rhachibus pinnarum angulo obtuso vel angulo recto divaricatis, pinnulis ordinis 

 secundarii a rhachibus pinnularum ordinis primarii angulo 70 vel plus acuto 

 divaricatis ; frons textura tenuiter herbacea viridis, costis venis venulis supra 

 obscure subtus distincte visis tenuissimis. 



HAB. Rinkiho, leg. H. INABA, Oct. 1911 ; Mt. Arisan ; Heishana, ad 

 7000 ped. alt., leg. B. HAYATA et TAKEO ITO, Mart., 1914. 



When I first examined a herbarium specimen of this fern, I thought that 

 it might have been a fern of scandent or pendulous habit, as the pinnae and 

 pinnule are always turning backwards and the rhachis is very flexuose. In 

 my last excursion to the island, I found the fern, quite contrary to my 

 expectation, standing erect or nearly so on the ground. It is very rare ; I 

 could find the fern but once in my journey through the mountains. Some- 

 what allied to D. Maximowiczii in its habit, sori and size, but greatly differs 



