1 60 POLYPODIACEJE. 



Nat. Pfl. Fain. I.-4, p. 189. 



Var. melanocaulon HAY ATA n. v.=Poly8tiehum Maximowiczii var. 

 mclanocaulon HAY ATA. Textura quam typn crassiora ; stipitcs nigro-pur- 

 puraseontes. 



HAB. Nokozan, April!. 1916. 



Polypodiutn LINN. 



Polypodium Sllisha-stagnale HAYATA sp. nov. llhizoma rcpens teres 

 6 mm. in diametro sectionis viricle adpresse squamatum, squamis fnlvis ovato- 

 oblougis 5 mm. longis 2 mm. latis apiee acutis vel obtnsis basi peltatim 

 cordatis vel profimde cordatis, lobis cordis imbrieatis, margine erosis vel remote 

 erososetulosis. Stipes erectus 65 cm. longu.s stramineus iiitidns. Frons lanceo- 

 lato-liiiearis 60cm. longa 18cm. late pinnati-fida vel subpinnata, pinnis infimis 

 longissiuiis superioribus gradatim minoribus, pinnis lateralibus superrimis 

 minimis, pinna tcrminali loiigiorc ; pinnis lateralibus linearibus infimis 14cm. 

 longis 18 mm. latis apice obtusis vel acuminatis ; pinna terminal i lineari 

 10 cm. longa 13 mm. lata margine subintegra ; pinnis a rhachi frondis 

 angnlo 45 egressis utraque pagine glabris costis et vein's supra minus subtu.s 

 plus elevatis ; costa frondis utraque clevata hand sulcata, alis angusiissimis 

 23 mm. latis ; frons a mcdio sursum soritera. Sori rotundati 2 mm. in 

 diametro supra valde elevati, subtus valde impressi 1| mm. profundi ; recep- 

 taculum 1 mm. in diametro tenuiter elevatum. 



HAB. in stagnis Suisha, leg. B. HAYATA, Aprili. 26, 1916. 



TJie present new fern was found in a very boggy place in a floating 

 island in Suisha-lake. Very near P. longissimum BLUME, but distinguishable 

 from it by the thinner texture and by the deeper sunken sori. 



Tittaria Sxr. 

 Key to the Formosan Species of Vittaria. 



1. Sori sunk in a two-lipped marginal groove ( EuviUaria) 2 



Sori in a slightly intramarginal line, with the unaltered edge of the 



frond produced beyond and often rolled over it ( Tceniopsis) . . 4 



2. Fronds usually pendulous, very long usually over 30 cm., some- 



times attaining to 1m. or even more.... 3 



O 



Fronds usually erect more or less recurved at most 30 cm. long. 2-3 



