66 



subcarnose, glabrous, green ; midrib distinct ; veins inconspicuous. Floriferous 

 branches short, very numerous, erect-patent, divaricately dichotomous, with 

 aristato-cetaceous sterile extreme branchlets, corymb-like, loosely and cymosely 

 disposed with flowers, leafless, angulate, glabrous, viridescent. Flower very 

 minute, axillary, solitary, sessile, subsessile, or very shortly pedicellate, ebrac- 

 teate. Calyx deeply 5-parted, herbaceous, glabrous, viridescent, persistent ; 

 lobes obovate or obovato-elliptical, rounded-obtuse, concave, at length sub- 

 carinate dorsally, inappendicnlate, the middle green, both sides membrana- 

 ceous and diaphanous ; in fruit erect-patent and incarved holding the fruit, 

 unchanged but slightly enlarged. Ovary included, globose ; style 1, erect, 

 very short ; stigmas 2, patent, linear, longer than the style. Utricle 

 depressed, about ■§ mm. across ; pericarp very thin, pale, close to the seed. 

 Seed horizontal, lenticular with the obtuse margin, depressed, smooth, nigro- 

 purpurascent ; testa thin, crustaceous ; albumen copious, farinaceous ; embryo 

 annular, the caulicle somewhat longer than cotyledons. 



Nom. Jap. Hari-semhon (nov.). 



Hah. Prov. Shinano : Kawakami-mura in Minamisaku-gori {K. Ko- 

 yama\ 1904). 



New to the Flora of Japan, very rare. In the specimens I examined, 

 all the flowers bear no stamen, exhibiting a female habit. 



Distrih. Siberia, Mandshuria, Mongolia, Northern and Central China, 

 and Alaska. 



Isoetes (AquaticfB) echinospora Durieu in Bull. Soc. Bot. France, 

 VIII. p. 164; A. Braun in Verhandl. Bot. Ver. Brandenb. (1862) p. 24; 

 Babington in Journ. Bot. (1863) tab. 1; Milde, Fil. Eur. et Atl. (1867) p. 

 279 ; Baker in Journ. Bot. (1880) p. 67 ; Id. Handb. Fern-Allies (1887) p. 

 125; Engelm. in Trans. S. Louis Acad. Sc. IV. (1882) p. ; A. Gray, 



Man. Bot. ed. 5, p. 676; Sadebeck in Engler et Prantl, Nat. Pflanzen- 

 fam. I. 4, p. 776. 



Calamaria ecJdnospora O. Kuntze, Rev. Gen. PI. II. p. 828. 



Isoetes lacustris suhsp. echinospora Hook. fil. Stud. Fl. Brit. Isl. ed. 

 2, p. 505, et ed. 3, p. 526. 



var. asiatica Makino var. nov. 



Spoirmgia iinspotted, |-| covered by a broad velum. Leaves loith- 

 out stoma. Spinides of the. macrospore stouter. Microspore smooth. 



Small, wholly submersed. Caudex 2-lobed, about 7-20mm. across. 



