G7 



blackish brown ; lobes hemisphferical or compresso-hemisphierical, the inner 

 side densely emitting pale brown ( but darkish brown when dry) roots. 

 Leaves tufted, erect or erect-patent, about 8-30 in number, 3i-14cra. long, 

 l|-2i mm. across in the middle, darkish green, pale and pellucid and some- 

 times rosy towards the base, stiffish, straight or sometimes somewhat re- 

 curved, subulate, gradually tapering to the point which is obtuse under lens, 

 septate, subterete and slightly plane in front, but broadly concave in front 

 and lunate in section below, the lower edges thin and decurrent from the 

 dilated and concave phyllopode, which is deltoid or broadly deltoid in form 

 (4-7 mm. long, 5-11 mm. broad) and membranaceous on the border and 

 closely imbricated. Velum orbicular to elliptical, with a semiorbicular to 

 elliptical opening below extending to the middle. Ligule cordato-semiorbi- 

 cular or lato-cordate, mem])ranaceous towards the margin, 1^-lf mm. across, 

 Sporangia orbicular to elliptical, truncate or retuse at the u})per end, com- 

 pressed, thinly membranaceous, pale, 2^-4 mm. long. Macrospores white, 

 globose, but very slightly depressed, marked on one hemisphere with a tri- 

 crural elevated line, densely spinulose all over ; spinules erect, often broad 

 and flattened, obtuse or truncate moreover often slightly curved at the apex. 

 Microspores elliptical, slightly oblique in form. 



Nom. Jap. Hi7ne-midzunira (nov.). 



Hah. Prov. Shinano : Lake Nojiri {Komesaburo Yazawa ! 1903 ; T. 

 Mahinol Aug. 30, 1904; K. SMbatal Sept. 26, 1904). 



As diagnosed above, this differs from the typical one of Europe, wliich 

 has the sporangia with a narrow velum, macrospores with narrower spin- 

 ules, and slightly papillose njicrospores ; and from var. Braunii Engelm. 

 (=7. Braunii Durieu) of North America, which has the leaves with few 

 stomata towards the tip, and spotted sporangia, more approaching the 

 latter than the former. In Japan it is very rare, and the plant in 

 question was found growing in the sandy bottom of shallow water near 

 the margin of Lake Nojiri in the northern part of the province of Shinano, 

 where Mr. Komesaburo Yazawa collected it first. 



Isoetes (Amphibia3) japonica A. Braun in Verhandl. Bot. Ver. 

 Brandenb. (1862) p. 33 ; Baker in Journ. Bot. (1880) p. 109 ; Id. Handb. 

 Fern-Allies, p. 132; Miq. Prol. Fl. Jap. p. 390; Franch. et Sav. Enum. 

 PI. Jap. 11. p. 201 ; K. Ito, Nippon-Shokubutsu-Dzusetsu I. tab. 45 ; Sade- 

 beck in Engler et Prantl, Nat. Pflanzeiifam. I. 4, p. 778 ; Matsum. Ind. PI. 

 Jap. I. p. 363, 



