202 POLYPODIACE^E. 



HAB. Hainan, leg. Z. KATSUMADA, 1911. 



Leptochilus dichotomophlebia HAYATA in sched. herb. Taihokti. 



Near Gymnopteris variabilis (BEDD. Fern. Brit. Ind. t. 272 and 

 Handb. Fern. Brit. Ind. p. 429, fig. 258), but differs from that by the 

 lanceolate sterile fronds which are in our species much obtuse at the apex and 

 are gradually attenuated towards the base, and by the very short stipes ; also 

 near Gymnopteris Feei MOORE (BEDD. Fern. South Ind. t. 48), but differs from 

 it by the linear fertile fronds. Lateral veins in our fern are nearly feathery 

 towards the apex, but usually dichotomously branched downwards. Whether 

 the stipes are articulated to the rhizomes or not is very questionable. There 

 are seen faint lines, in which they are articulated, at the very base of the 

 stipes. The lines, however, are not clear so as to decide the existence of 

 articulation by themselves. 



Kephrolepis SCHOTT. 



Nephrolepis tenuissimum HAYATA sp. nov. (Fig. 137). Rhizoma ascen- 

 dens vel subrepens densiuscule foliosum, cum reliquis stipitum 1^ cm. in dia- 

 metro. Stipes basi dilatatus nigricans supra basin sursum castaneo-stramineus 

 basi densiuscule squamatus sursum gradatim glabratus, (squamis nigro-castaneis 

 triangulari-lanceolatis basi plus minus rotundatis margine integris vel 

 obscure remote dentiusculis apice acuminatis usque 3-4 mm. longis l- mm. 

 latis) usque 10 cm. longus graciUimus erectus supra profunde sulcatus plus 

 minus minute pilosus vel subglabratus. Frons lanceolata usque 20 cm. 

 longa 5 cm. lata apice tenuissime attenuato-acurninata (acuminibus lineari- 

 bus) basi leviter angustior simpliciter pinnata, piunis mediis horizon- 

 taliter pateutibus longissimis a se 1 cm. remotis 22 mm. lougis 6 mm. latis 

 oblique oblongo-linearibus apice obtusis basi latere superiore auriculato-pro- 

 ductis (auricula triangulari-oblonga latere interiore 8 mm. longa latere exteri- 

 ore 4 mm. longa apice rotundata basi latissima 4 mm. lata margine obscure 

 denticulata) basi latere inferiore cuneato-acutis breve petiolatis (petiolo 1 mm. 

 longo) margine obtuse remoteque obscure serrulatis, piunis inferioribus plus 

 minus reflexis plus minus gradatim brevioribus, infimis 18 mm. longis, super- 

 ioribus gradatim brevioribus plus minus ascendentibus versus summurn ad 

 dentes 3 mm. lougos abeuutibus ; rhachis frondis glaudaloso-hirsuta, pilis uni- 



