246 THE BOTANICAL MAGAZINE. [Vol. xxni. No. 275. 



posed, not secund, a little dilated and adnate at the base, 

 angustate, patent or erect-patent, the lower ones often reflexed. 



Nom. Jap. Tahvan-yatnasotetsu (nov.). 



Hab. Formosa : Rakurakusha (G. Nakahara ! herb. Sc. Coll. 

 Imp. Univ. Tokyo, Aug. 1905, no 458), Mushazan in Nanto 

 (T. Kawakami and U. Mori I herb. ibid. Aug. 10, 1906, no. 

 2402), Ekitaisan (T. Kawakami and U. Mori I herb. ibid. Aug. 

 9, 1908). 



ANALYTICAL KEY TO JAPANESE PLAGI0GYRIA. 



I Frond discolorons, niveo-farinose 

 beneath P. glauca Mett. 

 Frond concolorous, green. 2. 



(Sterile pinnae petiolulate P. cuphlebia Mett. 



VSterile pinnae sessile or adnate. 3. 



I Sterile pinnae sessile below and ad- 

 nate above P. adnata Bedd. 

 Sterile pinnae all broadly adnate. 4. 

 Fertile pinnae stipitate,the lower ones 



deformed and auriculiform P. stenoptera Diels. 



Feritile pinnae adnate, the lower ones 

 also normal. 5. 



(Back of the rachis flat P. Matsumureana Makino. 



(.Back of the rachis carinate P. Hayatana Makino. 



Monachosorum nipponicum Makino, sp. nov. 



A fern nigricant when dried, thinly dispersed with very 

 minute fulvous furfuraceous scales, about 36 cm. long. Rhi- 

 zome short, ascending and often curved, epaleaceous, rooting ; 

 roots filiform, with short branches, ferrugineo-nigrescent. 

 Stipes caespitose, slender, shorter than the frond, ferruginous 

 below but nigrescent at the basal portion, about 12-17 cm. 

 long. Frond deltoid-lanceolate, acuminate, membranaceous, 

 tripinnatifid or subtripinnate, about 17-23 cm. long, 8— 

 10 cm. broad ; rachis slender, apterous, longitudinally bi- 

 marginate in front ; pinnre sessile or nearly so, opposite or 

 alternate, patent or patent-divergent, subapproximate, many, 



I- 



