199 



Herposiphonia subdisticha Okam. 



Nom. Jap. : Kuro~hime-goke. 

 PL. CXLVI, Fig. 11-18. 



Herposiphonia subdisticha Okam. Contr. to the Knowl. of the 

 Mar. Alg. of Jap. Ill, (Bot. Mag. Tokyo Vol. XIII, 1899, no. 145 

 p. 37) PL I, f. 12-14. 



" Fronds filiform, almost cylindrical, about i cm. in length or 

 less, about 217 , in diameter, decumbent, adhering to substratum 

 by emitting root-fibres from the lower surface. Root-fibres simple, 

 elongated or remaining short, either ending with a blunt apex or 

 expanding into a radiato-scutate disc, limited to the main branches, 

 which are few and patent. ' Langtriebe ' and ' Kurztriebe ' are 

 arranged in a subdistichous manner, lying on almost but not quite 

 exactly on one and the same plane. While some ' Kurztriebe ' 

 arise from the dorsal side very slightly above the plane of 

 ' Langtriebe,' there are others which stand on the same level 

 with the latter. 'Langtriebe' spread out laterally with non- 

 inrolled apex, and ' Kurztriebe ' almost horizontally, while the 

 latter standing near the growing portion of the shoot are incurved 

 toward the apex of axis. The 'Langtriebe' stand on alternate 



sides at every fourth articulation, and the ' Kurztriebe ' similarly 



t 

 arise from articulations devoid of the 'Langtriebe.' A 'Langtrieb 



always stands directly above a ' Kurztrieb ' on the same side. 

 The latter is short, 500-600 /* long. 80-140 n broad, somewhat 

 cylindrico-oblong, tapering to a bluntish apex trom an equally broad 

 or slightly constricted base, carrying in its young state very short 

 and minute deciduous fibrillae at the apex. Tetraspores are ar- 

 ranged in a straight line in a slightly expanded ' Kurztrieb,' 4 or 



