2OO 



5 in number, externally covered by two outer cells of equal 

 length. Frond is ecorticated throughout, furnished in the main 

 branches with 1 1 pericentral tubes surrounding the central axis 

 vhich has a wider calibre, and shows 4-5 tubes in surface view. 

 Articulations about half as long as the diameter. Colour dark 

 brownish red, almost blackish when dry." Okam. I.e. 



Hab. : On various algae such as Gelidiwn, Anipliiroa etc. 

 between tidemarks. Prov. Hyuga, Futae (Prov. Higo), Enoshima, 

 Bosyu. 



Remarks. " Owing to the greater obsculity of the dorso- 

 ventral arrangement of parts than in Herposiphonia fissidentoides 

 Holmes, 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 very closely allied to H. fissidentoides 

 differs from the latter in the narrow and non-leafy ' Krrztriebe. k 

 Okam. I.e. 



PI. CXLVI, Fig. 11-18. Fig. 11: fronds of Herposhiphonia 

 subdisticJia Okam. in nat. state, \. Fig. 12 : frond detached from 

 the substratum, \. Fig. 13: growing apex of a " Langtrieb " pre- 

 senting well-defined dorso-ventral ch.-iracter, viewed from under-surface 

 that is ventral side, toward which bend the apices of all the young 

 shoots; a, b stand on the other side opposite to that of c, d; 

 ^p. Fig. 14: cross-section of a "Langtrieb," ^-. Fig. 15: 

 cross-section of a " Kurztrieb," ^p. Fig. 16 : root disc, ^ Fig. 

 17 : portion of frond bearing tetraspores, viewed from the upper 

 that is dorsal side ; all the apices of ramuli bend toward the under 

 surface, ^. Fig. 18: "Kurztrieb" bearing tetraspores ; d, covering 

 cells, ap. 



