169 



\Yeber v. Bosse Liste d. Alg. d. Siboga I, p. 97, fig. 24 ; Vickers 

 Phycokologica Barbadensis p. 25, PL XXXVII. 



Fronds small, weak and filiform with a short not-well-defined 

 (not as is usual for other related species) surculus, attaining a height 

 of 1-2 cm. being- C a. 100 /< thick. Only one or two fronds arise 

 from an extremity of the surculus which is unequal in the thickness, 

 being here and there swollen at longer or shorter intervals and 

 root fibres are mostly emitted from the swollen portions. Plant 

 branches divaricate-alternately and branches are loosely closed with 

 ramenta. Ramenta are typically distichous and opposite ; but this 

 regular disposition is disturbed by the presence of some irregularly 

 inserted ones. They are separated by wider distances and the 

 rachis is distinct!)- visible through the interstices. They are oblong 

 or cbovate, being slightly swollen upwards, and are neither falcate 

 nor pointed, but very patent, straight and very obtuse at apex. 

 The bases of ramenta are sometimes equally broad or a little 

 narrowed as if pedicellated. Ramenta attain in a fully grown frond 

 a length of 216-354 /-<; the shorter one half that amount. The 

 breadth is almost equal to or a little thicker than the diameter of 

 the rachis in swollen ones, being somewhat slender in the more 

 cylindrical ones. The portion of rachis intercepted between two 

 opposite ramenta is slightly constricted as if articulated; it is more 

 especially so in frond bearing ramenta constricted at base. In 

 frond bearing ramenta which are not narrowed at base, the constric- 

 tion of rachis is not so marked. Ccl.n- bluish green. Substance 

 soft and thin membranaceous. 



Hal). : On rocks near low tide marks in shady place at Ne- 

 moto in Prov. Boshyu ; Ogasawarajima. 



