Plants Japonenses novse vel minus cognitae. 



[Continued from p. 32.) 



By 

 T. Makino, 



Assistant of Botany in the Science College, 

 Imperial University, Tokyo. 



Hymenophyllum oligosorum Makino sp. nov. 



Ehizome horizontally wide-creeping, setaceous, fuscous-brown , with loosely 

 fibrous roots ; scales piliform, nearly adpressed, crispate, 2-celled, light leather- 

 coloured, but ferruginous when dry, denser towards the young apical tip of the 

 rhizome, and thinly dispersed on the young stipes, rachis and nerves of the 

 frond beneath. Stipes filiform, laxly placed on the rhizome, much shorter 

 than the frond, upper half very narrowly alate, about i — 2cm long. Frond 

 dilute green, but olivaceous or brownish-olivaceous when dry, oval to oval- 

 oblong, rounded at the apex, but abrupted in the soriferous ones, usually 

 truncato-subcordate at the base, rather firm in texture, naked but furnished 

 with thinly hair-scales on the rachis and nerves underneath as above 

 described, lj— 4cm or more long, l-2Jcm broad; pinnee 3 to 9 on each 

 side, closely placed, spreading, sessile, ovate, obtuse, obliquely and broadly 

 cuneate at the base and confluent to the rachis-wing to which the upper 

 lower side is parallel, very slightly crispate, deeply pinnatifid into a few 

 simple or bifurcate segments; segments erect-patent, close-placed, oblong, 1-J — 

 2mm broad, rounded-obtuse at the apex, nearly entire on margin but very 

 obscurely and very minutely denticulate, one-nerved ; main rachis broadly 

 winged, flexuous, fuscous ; secondary rachis also flexuous ; veinlets loose, 

 erect-patent, green in living specimens. Sori 2 — 10, terminal, and often 

 lateral on the superior pinna, approximate, almost rounded, l^~2i-mm 

 each way, rounded at the base ; involucre orbicular, erose and sometimes 

 subtruncate on front margin, naked, divided down to the base into 2- 

 valves ; sporangia numerous, clustered in capitate manner on the top of a 

 short receptacular column, included, shortly pedicellate, with reddish and 

 incomplete ring. 



