160 



POLYPODIACE^E. 



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



Var. melanocaulon HAY ATA 11. v. = Polystichum Maxinwwiczii var. 

 mdanocaidon HAYATA. Textura quam typo crassiora ; stipites nigro-pur- 

 purascentes. 



HAB. Nokozan, Aprili. 1916. 



Folypodiutn LINX. 



Folypodium suisha-stagnale HAYATA sp. nov. Rhizoma repeiis teres 

 6 mm. in diametro sectionis viride adpresse squamatuni, sqnamis fulvis ovato- 

 oblongis 5 mm. longis 2 mm. latis apice acutis vel obtusis basi peltatim 

 cordatis vel profunde cordatis, Ipbis cordis imbricatis, niargine erosis vel remote 

 eroso-setulosis. Stipes erectus 65 cm. longus stramineus nitidus. Frons lanceo- 

 lato-linearis 60 cm. longa 18 cm. Tata pinnati-fida vel subpinnata, pinnis iiifimis 

 longissimis superioribus gradatim minoribus, pinnis lateralibus superrimis 

 minimis, pinna terminali longiore ; pinnis lateralibus linearibus infimis 14 cm. 

 longis 18 mm. latis apice obtnsis vel acuminatis ; pinna terminali lineari 

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

 angulo 45 egressis utraque pagine glabris costis et vein's supra minus subtus 

 plus elevatis ; costa, frondis utraque elevata haud sulcata, alis angustissimis 

 2-3 mm. latis; frons a medio sursum sorifera. Sori rotundati 2mm. 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. 



The 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 Sir. 

 Key to the Forinosaii Species of Vittaria. 



1. Sori sunk in a two-lipped marginal groove ( Eavittaria) 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 30cm., some- 



times attaining to 1 m. or even more 3 



Fronds usually erect more or less recurved at most 30 cm. long. 23 



