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). Khizoma? 



Stipes 40 cm. longus parce squamatus, squamis 

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

 pubescens. Frons longe triangularis 60cm. 

 longa 40 cm. lata apice triangulari-acuminata 

 basi in ambitu obtriangulari-acuta inferiore 

 bipinnata, pinnis inferioribus a se 8-10 cm. 

 remotis a rhachibus 70-90 divaricatis, pinnis 

 infimis triangularibus 20 cm. longis basi totius- 

 que latis apice triangulari-acutis breve petio- 

 latis (petiolis 1 cm. longis) insequilateralibus 

 latere superiore 8 cm. latis, latere inferiore 14 

 cm. latis, pinnulis inferioribus a se 3cm. 

 remotis a costa pinnae angulo 80-90 divarica- 

 tis, pinnulis infimis (latere inferiore) longissimis 

 superioribus gradatim brevioribus, infimis 

 longissimis lineari-lanceolatis 14 cm. longis 3 

 cm. latis apice acuminatis basi truncatis latis- 

 i simis breve petiolatis vel sessilibus pinnati- 

 fidis vel pinnatilobis, lobis lineari-oblongis 

 17mm. longis 6 mm. latis apice obtusis 



margine cre- 

 nulatis, crenu- 

 lis ascen- 

 dentibus ; sti- 

 pites, rhaches 

 costaeque toto 

 castaneo-rube- 

 scentes; frons 



j 



Fig. 122, Dryopteris tvnuifrons HAYATA ; a, the plant ; b, a scale on 

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



textura tenuissime herbaceo-membranacea supra plus minus pubescens, pilis 



