Observations on the Flora of Japan. 



{Continued from p. 138.) 



By 

 T. Makino. 



Gleichenia (Mertensia) kiusiana Makino sp. nov. 



Rhizome widely repent, strong, terete, hard, clothed with scales (scales 

 often deciduous, therefore the rhizome naked and disparsedly suhmuricated 

 with short hard processes which are the bases of scales), very laxly branched, 

 loosely rooting, brownish-fulvous, about 5 mm. across ; roots rather short, 

 black, with short rootlets. Stipe distantly placed on* the rhizome, erect, 

 slender, long, hard, subterete, shallowly and broadly furrowed with an obtuse 

 or subacute slender margins throughout in front, rounded in the back, 

 srlabrous and viridescent, but brownish fulvous and clothed with scales at 

 the base (which is, when scales fallen off, submuricate as is the rhizome), 

 attaining about 7decim. in length, 4-6| mm. across below, with a fibro- 

 vascular bundle in centre. Scales rufo-ferruginous, lanceolate to ovate, long- 

 acuminate, auriculate or nearly so at the base, entire, firm-membranaceous, 

 with close very numerous and minute longitudinal areolae, often deciduous. 

 Frond unijugate in first year, but bijugate in the next year (the second 

 stipe developed from the axillary bud which is situated between the first 

 pair of frond, 9-20 cm. in length, erect, furnished with a minute rudiment- 

 ary bud at the top) ; piume furcately opposite, very shortly petioled, ovate 

 to angustate-ovate, attenuatedly acuminate at the apex, obtuse at the base, 

 rigid, yellowish green, concolorous, glabrous above, but beneath densely 

 covered with very minute translucent granules under microscope and thinly 

 disparsed with adpresso-declinate short subclavate minute glandular hairs which 

 are black in the apical portion, attaining 50 cm. long, 27 cm. broad, those 

 of the superior pair smaller ; rachis slender, obscurely flexuous, narrowly 

 canaliculate in front, pale stramineous, glabrous. Pinnules numerous, about 

 18-28 on each side, closely placed, erect-patent, alternate, . very shortly 

 s.tipitate, but sessile in the superior ones, narrowly lanceolate, acuminate, 

 subobliquely acute at the base, attaining about 20 cm. long, 4 cm. wide, 

 the lower ones largest excepting the lowest one smaller ; second rachis 

 slender, very shallowly canaliculate in front, prominent dorsally, glabrous, 

 pale stramineous. Segments cut down to the rachis, numerous, alternate, 



