312 POLYPODIACE/E. 



tis, pulvinis stipitum usque ad 2 mm. altis elevatis squamis dense obtectis ; squa- 

 mis rhizomatis ovato-lanceolatis 2^ mm. longis 1 mm. latis apice acutis basi 

 rotundatis peltatis basi partibus peltatis margine lobatis creterum eroso-integris. 

 Stipes 8 cm. longus subteres plus minus dorso complanatus glaber nitidus cas- 

 taneo-stramineus. Frons longissime lanceolato-linearis 40cm. longa stipitem in 

 longitudine 5-plo superans 2cm. lata infra medium latissima sursum longissime 

 attenuata acuminatissima ad acumen lineare 2mm. latum abeuns ad summum 

 acuta basi gradatim cuneato-attenuata margine subintegra vel obscure undulata 

 ad niarginem subplana, costa medio supra elevata f mm. lata subtus minus 

 elevata; textura in exsiccato coriacea in vivo tenuiter coriacea, pagina hand 

 nitida supra pallido-viridis subtus pallidior in exsiccato fuscens supra glabra 

 subtus subglabra, venis venulis sub luce transversa auastomosantibus reticulatis. 

 Sori a infra medium frondis usque ad infra acumen utroque latere costas 1 -seria- 

 tim dispositi oblongi longiores quam latiores 4 mm. longi 2^ mm. lati, pagina 

 supra ad receptaculum sori impressa, partibus impressis ellipticis vel linearibus 

 3 mm. longis 1mm. latis; reticulis venularum utraque pagine tenuissime clevatis. 



HAD. Mt. Arisan, leg. TAKEO ITO et B. HAY ATA, Mart, 1914. 



Whether this species is identical with P. obscure-venulosum or not demands 

 further investigation. 



Polypodium ensatum THUNB.; HOOKER et BAKER Syn. Fil. p. 361. 



HAB. Arisan: Nimandaira, leg. B. HAYATA et TAKEO ITO, April i. 1914. 



This fern, though common in Japan, is very limited in Formosa. It is 

 found only in some high elevations and is rather rare. The Forrnosan form 

 lias much larger fronds and longer stipes. 



Polypodium ensato-sessilifrons HAYATA sp. nov. (Fig. 126-A-B). Rhizo- 

 ma repens subcomplanatum in exsiccato fusco-nigricans apice dense squamatum, 

 squamis rubro-castaneis fuscentibus caudato-ovatis 2i mm. longis limm. latis 

 hand cordatis hand peltatis margiue erosis vel subiutegris. Stipes brevissirnus 

 |-1 cm. longus supra canaliculatus subtus convextis. Frons subsessilis oblanceo- 

 lata apice acuminata supra medium latissima infra medium angustata deorsum 

 gradatim attenuata gradatim ad basin decurrens, partibus inferioribus minus 

 quam 1| cm. latis 5-10 cm. longis, margine plana subintegra vel repauda , 

 textura membranaceo-chartacea in exsiccato pellucida sujn-a castanea subtus 



