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E BOTANICAL MAGAZINE. 



April 10, 1891. No. 49. ] 



ew Japanese Acrostichum. 



Eyokichi Yatabe, Sc. D. 



Acrpstichum Yoshinagaae, nov. sp. 

 A/'o?^. jap, Atsuita. 7 V A 9^ 

 (Plate XXIII). 

 Rhizome short, creeping, at most 4 cm. long, with branched wiry roots, 

 densely clothed with ovate brown scales. Stipes clustered, scaly, canaliculate 

 in front, winged above, 4-8 cm. long in the sterile, often as much as 14 cm. long 

 Jn the fertile fronds. Sterile fronds perennial, coriaceous, deep-green on the 

 upper, pale on the under surface, narrowly lanceolate, subacute at the apex, gra- 

 dually narrowed and decurrent at the base, entire or slightly sinuate, with the 

 margin recurved and diaphanous, 15-28 cm. long. 2-3.5 cm. broad; veins rather 

 obscure, diverging from the thick costa at an angle of 60-70 degrees, about 2 

 mm. apart at the base, forked or simple, subparallel, terminating below the mar- 

 gin of the frond in a thickened and simple or forked apex. Fertile fronds lan- 

 ceolate, smaller and with closer veins than the sterile, about 15 cm. long, 2.5 

 cm. broad; sori covering the whole under surface except the costa. 



This fern grows on rocks and rarely on trunks of trees, along mountain 

 streams. It was first collected by Mr. E. Yoshinaga in August, 1887, at Hono- 

 kawa-yama in the province of Tosa. My specimens are mostly those sent 

 by him. 



