POLYPODIACE.E. 



201 



Polystichum Tsus-Simene J- Sm. Compared with a Japanese speci- 

 men in the Tokyo herbarium. 



Hab. Aiisan : pix)pe Senninbora, leg. B. Hayata et T. Ito, Mart., 1914. 

 Gymnopteris Bernh. 



Gymnopteris dichotomophlebia Hayata sp. nov. i Fig. 136). Ehizoma 

 repens 2-3 mm. in diametro squamis dense obtectum, squamis cordato-ovatis 

 apice obtusis vel acutis 2-3 mm. lougis basi alte cordatis (lobis cordis profunde 

 imbricatis) apice obtusis vel acimiinatis. Stipes cum rhizomate continuus haud 

 articulatus. Frons sterihs cum stipitibus lanceolata vel elliptico-Ianceolata 

 20-25 cm. longa 3-3i cm. lata apice triangulari-obtusa basi gradntim angustata 

 attenuata ad stipitem brevissimum 3—4 mm. longum abeuns j 

 margine integi-a membranacea in exsiccato peUucida dis- 

 tincte venosa, costis tenuibus utraque pagine distincte 

 elevatis, venis laterahbus plerumque dichotome ramosis 

 reticulato - anastomosanti - 

 bus (areohs costalibus 

 subtriangularibus 7-8 mm. 

 longis venulara liberam 

 singulam fm'cato-ramosam 

 includentibus), venis venu- 

 hsque utraque pagine dis- 

 tincte elevatis tenuibus ; 

 pagina membranaceo- 

 chartacea margine integra 

 vel sensim repanda. Frons 

 fertihs longe stipitata, 

 stipitibus tenuibus fronde 

 sequilongis 27 cm. longis 

 glabris subcomplanatis li mm. in diametro. Lamina angustissime liuearis stipitem 

 sequans vel brevior 23 cm. longa 3-3|- mm. lata apice acuminata basi gradatim 

 attenuata ad stipitem abeims supra glabra, costa elevata, margine integra 

 leviter desuper recuiTa subtus toto sorifera ; paraphyses lineares apice plus 

 minus clavatje. 



Pig. 136, Gyrmiopterhi dir/wtomop/deljia Hayata ; a 

 sterile fronds of the pl.-jnt ; b, fertile fronds ; c, a scale on 

 the rhizome ; d. portion of a sterile frond ; e, cross section 

 of a fertile frond. 



