Plantse Japonenses novse vel minus cognitse. 



{Continued from ji. 16.) 



By 

 T. Makino, 



Assistant of Botany in the Science College, 

 Imperial University, Tokyo- 



Athyrium microsorum Makino nom. nor. 



Caudex skort, creeping, rooting, clothed with tawny-brown scales ; 

 scales broadly linear, gradually acuminate, nearly entire, thinly membra- 

 naceous, with delicate veins and numerous fine longitudinal areolae. 

 Stipes stout, long, herbaceous, brownish-stramineous when dry, very laxly 

 scaly, well developed ones about 40 cm or more long. Fronds often 

 ample, ovate, acuminate, quadripinnatifid, thinly herbaceous, flaccid, nearly 

 glabrous, but common and secondary rachis thinly dispersed with light 

 brown linear scales ; primary phrase spreading or erect-patent, alternate, 

 about 10 on each side of the rachis, ovate-lanceolate, acuminate, shortly 

 petioled, largest ones about 27 cm long, 14 cm broad ; secondary pinna? 

 spreading, alternate, deltoid-lanceolate, acuminate, shortly petiolulate, pin- 

 nate with rather many pinnules, with stout-filiform rachis, largest ones 

 about 8cm long, 4cm broad; pinnules horizontally patent, narrowly 

 deltoid, obtuse, with very short petiolole, usually trimcate-subcordate at the 

 base, deeply pinnatifid into several small segments on each side, |-1 J cm 

 long, J-l cm broad ; segments elliptical-ovate, obtuse, paucicrenate ; veins 

 erect-patent, flexuous above, pinnate ; veinlets few or several, mostly 2- 

 forked, free, loose ; common rachis stout, slightly flexuous, herbaceous. 

 Sori very numerous, minute, reniform-horseshoe-shaped, but upper ones in 

 the ultimate segments of the frond ovate and smaller, 2-5 upon the 

 inferior segments of the pinnules but only 1 upon the superior segments, 

 each dorsal on the lower part of the veinlets, arranged on both sides 

 near the costa of the pinnules or segments ; indusium very thinly mem- 

 branaceous, pellucid, some reniform-horseshoe-shaped and others broadly 



