184 



rOLYPODIACE^E. 



HAB. Arisan, leg. B. HAYATA, 1912, Jan. 



Near D. laxa, but differs from it by the not ciliate indusium and less 

 hairy fronds. 



Dryopteris (Clenitis) tenuifrons HAYATA sp. nov. (Fig. 122). Rhizoma? 



Stipes 40 cm. longus parce squaraatus, squamis 

 lanceolatis 4 mm. lougis 1 mm. latis, sub lente 

 pubescens. Frous longe triaugularis 60cm. 

 longa 40 cm. lata apice triangulari-acuminata 

 basi in ambitu obtriaugulari-acuta inferior*; 

 bipinnata, piunis inferioribns a se 8-10 cm. 

 remotis a rhachibus 70-90 divaricatis,. pinnis 

 infimis triaugularibus 20 cm. longis basi totius- 

 que latis apice triaugulari-acutis breve petio- 

 latis (petiolis 1 cm. longis) intequilateralibus 

 latere superiore 8 cm. latis, latere iuferiore 14 

 cm. latis, piniiulis inferioribus a se 3cm. 

 remotis a costa pinna? angulo 80-90 divarica- 

 tis, pinnulis infimis (latere inferiore) longissimis 

 superioribus gradatim brevioribus, iufimis 

 longissimis liueari-lanceolatis 14 cm. lougis 3 

 cm. latis apice acuminatis basi truncatis latis- 

 simis breve petiolatis vel sessilibus pinnati- 

 fidis vel pinuatilobis, lobis lineari-oblougis 

 17 mm. longis 6 m m . latis apice obtusis 



margine cre- 

 uulatis, creuu- 

 lis asceu- 

 dentibus ; sti- 

 pites, rhaches 

 costseque toto 

 castaneo-rube- 

 scentes ; frons 



Fig. 122, Dryopteris ttnuifrons HAYATA ; a, the plant ; h, a scale on 

 the stipe ; c, a hair on the costa of a pinnule ; d, a portion of a pinna. 



textura tenuissime herbaceo-membranafea supra plus minus pubescens, pilis 



