rOLYPoDIACE^E. 245 



reflexis brevioribiis 4i cm. lougis ; costis segmeutoriiin snpra Iplauo-elevatis, 

 sul)tns aeuto-elev.itis ; areolis costalibus secus rliachin froudis liuearibns mediis 

 li cm. longis 1} mm. latis ; costis venis vennlisqne utraqne pagine distiucte 

 nigro-coloratis ; xmgina supra glabra subtns ad eostas venasque sub lente 

 minute parcissimo sqnamata vel demum glabrata. Textm'a membrauacea. 

 Sori dorso ad paginam superiorem elevati, partibus elevatis rotuudatis medio 

 umbcmato-impressis. 



Hab. Aiisau, ad 8000-7000 ped. alt., leg. B. Hayata et S. Sasaki, 

 Jau., 1912. 



Near PoJypodmm formomnum Bakee, but differs from it by the more 

 acuminate pinnas which are more or less ascending, bnt not quite horizontally 

 arranged hke those of P. formosamim. AIso near P. amcemtm Wall. = 

 Gonio^jMebivm amcenum J. Sm. (Bedd. Fern. Brit. Ind. t. 5), but distiugnish- 

 able from it by the qnite naked fronds with mnch longer linear tsrminal lobes. 

 Polypodium decrescens Chrlst (Fig. 171) var. bleehnifrons u. v. 

 Khizoma repens teres teuue miuns 1 mm. crassum dense sqnamatum dense 

 radicans dense foliosum, squamis fusco-castaueis teuuissimis lauceolatis 4 mm. 

 loDgis 5 mm. latis apice acnmiuatis basi rotundatis subcordatis non peltatis. 

 Stipes brevis usqne 1 cm. lougus semiteres supra (intns) plauus deusiuscule j)ilis 

 horizontaliter pateutibus obtectns, pilis 1-seriatim phuicellularibus castaneo- 

 rubescentibus 1| mm. longis apice clavatis, prasterea piHs brevissimis 2- 

 cellularibus apice clavatis latioribus parce dispersus. Frons lanceolata vel 

 oblougo-lanceolata 13 cm. longa 3 cm. lata apice acuta vel caudato-acumiuata 

 (candis hnearibus 2^ cm. longis 2^ mm. latis ad summum obtusis) vel ecandata 



I simphciter acuta basi subito cuneata attenuata lineari-attennata ad stipitem 

 1 cm. longum abevms, (partibus attennatis 4|- cm. longis sursum 1 cm. latis 

 deorsum IJ-lmm. latis margine undulato-repandis, undulis gradatim minori- 

 bus demum ad nullum abeuntibus, nndulis superioribus triangnlaribus 4 mm. 



I latis 2 mm. longis apice obtuso-rotundatis), pai-tibus principalibus (partibus 



' froudis exceptis partibus attenuatis et caudis) toto circ. ad rhachin 

 pinnatifidis, segmentis linearibus rectis circ. angulo 5G°-60'' a rhachibns frondis 



I egressis versus apicem angustioribus ad summum obtusis deorsum latioribus 

 ad basin plus minus dilatatis, mediis 13 mm. longis basi .3-4 mm. latis a se (a 



