45 



Nom. Jap. Kiyosumi-kokeshinobu (T. Makino nom. nov.) 



Bab. Prov. Awa ( = Boshu): Mt. Kiyosunii-yarna (Herb.! Sc. Coll. 



Imp. Univ. Tokyo, June 10, 1882 ; T. Makino ! April 6, 1896, April 1898). 

 A rare species not yet known from other localities, and found in 



the above locality much densely growing on the basal portion of the trunk 



of large trees. 



Hymenophyllum flexile Makino sp. nov. 



Khizome wiry, wide-creeping, laxly branched, darkish-brown, nearly 

 naked,- rooting. Stipes loosely placed on the rhizome, slenderly elongate, 

 w'iry, hard, naked but margined with narrowly crispate wings on both sides 

 except the lower portion, shorter than the frond, 2 — 9cm in length. Frond 

 lanceolate, or broadly lanceolate, sometimes ovate-lanceolate, shortly subacumi- 

 nate, 8 —25cm long, 3 — 5 Jem broad, tripinnatifid or subquadripinnatifid, thin, 

 flexible, naked, but thinly and very minutely scaly on the rachis and nerves 

 beneath, darkish ferruginous-brown when dry ; pinnae usually erect- patent, 

 10—14 on each side, moderately closed, or laxly distant in the superior 

 and inferior, narrowly triaugular-rhomboidal, or sometimes rhomboidal- 

 deltoid, often somewhat falcate, broadly cuneate at the base, very shortly 

 petioled or nearly sessile, divided down nearly to the rachis into few or 

 several pinnules on each side, lowest ones decreasing in size, largest ones 

 about 5cm long, nearly 2cm broad ; pinnules cuneate-ovate, deeply divided 

 into few simple or bifurcate segments in the lower ones, but upper, ones 

 only bifurcate or simple ; ultimate segments narrowly oblong, entire, obtuse 

 or retuse at the apex, LJ— 2mm broad; main rachis slender, crispato- 

 winged throughout, each lateral wing 1 to H mTn in width. Sori rather 

 copious, laxly disposed except the apical and lower portions of frond, 

 1 to 15 to a pinna, terminating the inner lower segments of the pinnules, 

 rounded or broadly rounded, rounded at the base, 1J— 2jmm each way; 

 involucre divided down to very base, naked; valves orbicular, sometimes 

 truncate in front, erose-dendate on front margin ; sporangia numerous, 

 clustered in capitate manner on the top of a short receptacular column, 

 included, very shortly pedicellate, with incomplete ring. 



Nom. Jap. O-kokesliwobu. 



Bab. Prov. Kn : Mt. Nachiyama (Z. Matsumura ! herb. Sc. Coll. 

 Imp. Univ. Tokyo, July 25, 1883 ; M. Miyoshi ! herb. 1. c. Aug. 18, 

 1887); Prov. Tosa : Near Mt. Tebako-yama (T. Makino ! Aug. 1885), 

 Mt. Honokawa-yama (T. Makino ! Aug. 10, 1887), Mt. Kurotaki-yama 

 (T. Makino ! Nov. 1892). 



