312 POLYPODIACE.E. 



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

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

 rotundatis peltatis basi partibus peltatis margine lobatis caeterum ei-oso-integris. 

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

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

 longitudine 5-plo superans 2 cm. 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 marginem subplana, costa medio supra elevata mm. lata subtus minus 

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

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

 subtus subglabra, venis venulis sub luce transversa anastomosantibus reticulatis. 

 Sori a infra medium frondis usque ad infra acumen utroque latere costge 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 

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



HAB. Mt. Arisan, leg. TAKEO ITO et B. HAYATA, 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, Aprili. 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 Formosan form 

 has much larger fronds and longer stipes. 



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

 ina repens subcomplanatuni in exsiccato fusco-nigricans apice dense squamatum, 

 squamis rubro-castaneis fuscentibus caudato-ovatis 2| mm. longis l^mm. latis 

 hand cordatis haud peltatis margine erosis vel subintegris. Stipes brevissimus 

 ^-1 cm. longus supra canaliculatus subtus convexus. Frons subsessilis oblanceo- 

 lata apice acuminata supra medium latissima infra medium angustata deorsum 

 gradatim attenuata gradatim ad basin decurrens, partibus inferioribus minus 

 quam 1 J cm. latis 5-10 cm. longis, margine plana subintegra vel repanda , 

 textura membranaceo-chartacea in exsiccato pellucida supra castanea subtus 



