THE BOTANICAL MAGAZINE. 



[Vol. V. August 10,1891. Xo. 54.] 



Ferns of Japan. 



No. 4. 

 Ryokichi Yatabe, Sc. D. 



Polypodium Someyae, nov. sp. 

 Nom. jap. Mybgi-shida. ;^ ^ ^ ^ ^ 

 (Plate XXVII.; 

 Rhizome creeping, clothed with dark-brown scales. Stipes scattered, 

 articulated at the base, naked, slender, about 10 cm. long. Fronds annual, 

 herbaceous, slightly hairy, broadly lanceolate, accuminate, pinnatifid nearly to 

 the rachis, usually 20-25 cm. long, 10-12 cm, broad. Segments usually 1 5 

 -20 on each side of the rachis, spreading, linear- lanceolate, crenate-serrate, 

 acute, separated by rounded sinuses. Veins proceeding from the base of the 

 midveins of the segments forming a series of narrow areola along each side of 

 the rachis; those of the segments forming ample polygonal areolae on both 

 sides of the mid vein, each with a single distinct free included veinlet; 

 ultimate veinlets terminating in somewhat clavate apices near the margins 

 of the segment. Sori globose, in a single series on each side of the midvein, 

 terminal on the included veinlets, about midway between the midvein and 

 margin of the segments. 



Specimens of this fern were first collected by Mr. T. Someya in 

 September, 1887, on Mt. Myogi in the province of Kozuke. I have not 

 yet seen specimens from any other locality. 



