POLYPODIACKE. 



201 



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

 men in the Tokyo herbarium. 



HAB. Arisan : prope Senninbora, leg. B. HAYATA et T. ITO, Mart., 1914. 

 Gymnopteris BERNH. 



Gymnopteris dichotomophlebia HAYATA sp. nov. (Fig. 136). Rhizoma 

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

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

 imbricatis) apice obtusis vel acuminatis. Stipes cum rhizomate continuus hand 

 articulatus. Frons sterilis cum stipitibus lanceolata vel elliptico-lanceolata 

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

 attenuata ad stipitem brevissimum 3-4 mm. longum abeuns 

 margine integra membranacea in exsiccato pellucida dis- 

 tincte venosa, costis tenuibus utraque pagine distincte 

 elevatis, venis lateraHbus plerumque dichotome ramosis 

 reticulato - anastomosanti - 

 bus (areoh's costalibus 

 subtriangularibus 7-8 mm. 

 longis venulam liberam 

 singulam furcato-ramosam 

 includentibus), venis venu- 

 lisque utraque pagine dis- 

 tincte elevatis tenuibus ; 

 pagina membranaceo- 

 chartacea margine integra 

 vel sensim repanda. Frons 

 fertilis longe stipitata, 

 stipitibus tenuibus fronde 

 sequilongis 27 cm. longis 

 glabris subcomplanatis l mm. in diametro. Lamina angustissime linearis stipitem 

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

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

 leviter desuper recurva subtus toto sorifera ; paraphyses lineares apice plus 

 minus clavatse. 



Pig. 136, Gymnopteris dichotomopfdebia HAYATA ; a 

 sterile fronds of the plant ; b, fertile fronds ; c, a scale on 

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

 of a fertile frond. 



