38 



Hob. On various algae, such as Gelidinm, Amphiroa &c, between 

 tide marks. Enoshima ; Boshu. 



Description : Frond filiform, almost cylindrical, about 1 cm. in 

 length or less, about 217 p. in diameter, decumbent, adhering to substratum 

 by emitting root-fibres from the lower surface. Boot-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 stand- 

 ing near the growing portion of the shoot are incurved toward the axis. 

 The Ci Langtriebe " stand on alternate sides at every fourth articulation, 

 and the " Kurztriebe " similarly 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 jut long, 80-140 fi 

 broad, somewhat cylindrico-oblong, tapering to a bluntish apex from an 

 equally broad or slightly constricted base, carrying in its young state very 

 short and minute deciduous fTbrillae at the apex. Tetraspores are arranged 

 in a straight line in a slightly expanded " Kurztrieb,' 7 4 or 5 in number, 

 externally covered by two outer cells of equal length. Frond is ecorticated 

 throughout, furnished in the main branches with 11 pericentral tubes 

 surrounding the central axis which has a wider calibre, and shows 4-5 

 tubes in surface view. Articulations about half as long as the diameter. 

 Color, dark brawnishred, almost blackish when dry. 



Bern arks ; Owing to the greater obscurity of the dorso-ventral 

 arrangement of parts than in Herposiphonia Jisidentoides, the present 

 plant does not appear at first glance to be referable to this genus ; but 

 its regular arrangement of " Langtriebe " and the formation of fruits in 

 " Kurztriebe " tell us its nature. The present plant which is veiy closely 

 allied to H. fissidentoides differs from the latter, as I have stated in 

 another place, in the narrow and non-leafy " Kurztriebe." 



Chlanidote decumbensa Sp. nov. Fig. 23-25. 

 Diagnosis : Fronds decumbent, radially and repeatedly torn up into 



