THE BOTANICAL MAGAZINE. 



[Vol. V. May lo. 1891. ^^,,^':^"^''^o, ^i^] 



A New Japanese Acrosticliurti. „ . ^ , *- • n 



Ryokichi Yatabe, Sc. dJ ' ^ """"T~7 ' 



Acrostichum tosaense, sp. nov. '*^«<^. ^^'- ' " ' ^.- "" 

 Nom.jap. Hii'oha-atsuita. fc p /^ T 5^ 'f -^ 

 (Plate XXIV.) 

 Rhizome creeping, several cm. long, with long branched roots, densely 

 clothed with brown linear-lanceolate or lanceolate and very slender-pointed 

 scales. Stipes approximate, with scales like those of the rhizome, usually 3-4 

 cm. long in the sterile fronds, in large specimens as much as 7 cm. long, longer 

 in the fertile fronds and usually about 7 cm. long. Sterile fronds perennial, 

 subcoriaceous, deep-green on the upper, pale on the under surface, oblong-oval 

 entire or slightly sinuate, with a distinct and diaphanous margin, obtuse at the 

 apex, tapering and decurrent at the base, scattered with appressed branched 

 hairs on both surfaces, usually 6-12 cm. long and 2-3 cm. broad, in large 

 ^specimens sometimes 15 cm. long and 4 cm. broad; veins rather obscure, 

 somewhat recurved, diverging at first from the thick costa at an angle of 30-40 

 degrees then of 60-70 degrees, about 2 mm. apart at the base, mostly forked, 

 subparallel, terminating below the margin of the frond in a thickened forked 

 apex. Fertile fronds similar to the sterile, smaller, about 5 cm. long and 1.5 

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



This fern grows on rocks, sometimes on trees, along streams in mountain 

 woods. It was first collected by Mr. E. Yoshinaga in August, 1887, at 



