146 



BOTANICAL MAGAZINE. 



[Vol. xvm. 



smaller; bracteoles setaceous, slightly longer or 

 shorter than spicule. Spiculse lato-lanceolate, at- 

 tenuatedly acuminate, acute at the base, compressed, 

 glabrous, pale fulvous, about 7 mm. long, with 1 

 perfect flower below and 1 very minute rudimentary 

 flower above. Glumes deeply navicular, carinate 

 with a smooth and viridescent edge, membrana- 

 ceous, pale towards the base ; empty ones 4-6, 

 oval-ovate, the lower ones gradually smaller and 

 shorter; flowering ones 2, much larger than empty 

 ones, the inferior one lato-ovate with an acute or 

 acutish tip, the superior one largest and ovate 

 with an obtuse tip, 6-6| mm. long. Setae 6, 

 delicate, filiform, smooth, irregularly flexuous, 

 white, unequal in length, the longest one a little 

 exceeding the rostrum of the achene and about 

 5-51 mm . long, the shortest one about equal to 

 the middle of the rostrum. Stamens 3, slightly 

 exserted ; filament slender, filiform, glabrous, some- 

 what exceeding the rostrum of the matured 

 achene, about 6-| mm. long. Achene rouuded, 

 compressed, suddenly short-stipitate, very shortly 

 produced at the apex, with an obtuse margin, 

 transversely rugulose towards the centre of faces, 

 yellowish umber, 2 mm. and a little more in 

 length including the stipitate portion ; rostrum 

 slender, longer than the achene, but very much 



narrower than it in width, gradually attenuated above, sessile and truncate 



with a free edge at the base, compressed, viridescent. 

 Nom. Jap. Mihuri-gaya (nov.). 

 Hob. Prov. Mikawa : Futakawa (Z. Umemura ! no. 90, Sept. 7, 1904). 



Isoetes japonica A. Br. Vide supra. 



Stock attaining 8 cm. in diameter. Caudex-lobes thick, deltoid, obtuse, 

 perpendicular or divergent, nigrescent, densely emitting roots on the inner 

 side. Leaves attaining 200 or more in number and 114 cm. in length 

 (so in the submersed or nearly submersed one), 6 mm. across in the base 

 above the phyllopode. {To be continued.) 



