47 



Tashiro ! herb. 1. c. Aug. 1887), Nakama-mura in Isl. Iriomote in Yaeyama 

 Archip. (H. Kuroiwa ! Aug. 14, 1892). 



It resembles Trichomanes maximum Blume in general appearance, 

 but the latter species has the creeping rhizome and the dilated mouth of 

 the involucres. W. J. Hooker's Trichomanes ancejps ft in his Species 

 Filicum vol. I. p. 135, may probably contain my species, and then the 

 latter may be found also in Philippine Islands. 



Trichomanes acutum Makino Notes on Jap. Plants XV. in Bot. 

 Mag., Tokyo, VI. 1892. p. 45. 



Khizome horizontally wide-creeping, filiform, fuscous-black, tomentose, 

 with loosely short roots. Stipes laxly placed on the rhizome, very short to 

 the longest ones being about 2cm in length, tomentose at the base, mar- 

 gined with wings gradually broader above. Frond small, delicate, ovate, or 

 narrowly ovate, § — 3cm long, § — 2cm or more wide, subnabellate-bipinnatifid, 

 or sometimes scarcely subtripinnatifid, thin, subdiaphanous, almost naked, 

 darker yellowish-green when dry, more or less crispate ; main rachis broadly 

 winged ; pinnfe erect-patent, a few or several on each side, sessile, cuneate- 

 ovate or narrow, pinnatind or subflabellate into narrowly deltoid very sharp- 

 ly acute and erect-patent segments which are rarely bifurcate in the lowest, 

 furnished with numerous oblique sprious venules. Sori only one to a pinna, 

 axillary, compressed, naked, the tube sunk in frond, subdeltoid, tapering 

 below, distinctly 2— lipped; lip dilated, ovate-deltoid, obtuse at the apex, 

 equal to or a little shorter than the tube, with irregular sprious vein near 

 the margin ; receptacle columnar, exserted, straight ; sporangium with large 

 ring. 



Nom. Jap. Koke-horagdke (T. Makino). 



Hab. Prov. Tosa : Shiraishi-mura in Hayama-go ( T. Makino ! Nov. 

 II, 1885), Ninotaki in Nauokawa-mura ( T. Makino ! Nov. 4, 1887), 

 Nanokawa-mura (K. Watanabe ! herb. Sc. Coll. Imp. Univ. Tokyo, March 

 26, 1891). 



This species is one of Didymoglossum group, and has an affinity to 

 Trichomanes Filicula Bory. The sharpness of the ultimate segments 

 makes this species very peculiar. Dr. H. Christ's Diagnosis of the species 

 was published in the " Bulletin de l'Herbier Boissier," IV. 1896, p. 665 ; and 

 the figure, together with above described Hymenophyllum oiigosorum, and 

 flexile, will appear in the fore-coming number of my " Phanerogams et 

 Pteridophyt&e Japonicte iconibus illustratae." 



