﻿So far as I can judge from literature only, among the 

 genera in Gdidiacece、 Ptilophora seems to show some relations to 

 the present plant from the presence of very numerous, stiff, 

 spinose, processes growing from the surface of the frond. The 

 abnormal growth of a lanceolate mid ribbed branches in the pre- 

 sent plant seems as if to show its affinity with those plants which 

 have flat and midribbed fronds. 



I have collected the present plant at Oriuzako in the province 

 of Hiuga on 13th July 1899, i.e. two days after my receiving the 

 lamentable news about the untimely death of my much honored 

 teacher, Prof. R. Yatabe who died on 7th July of the same 

 month. For his honour I have selected the generic name 

 " Yatabella、" as the generic name u Yatabe a iy was established 



， o 



formerly by Maxim owicktz, though that genus was afterward reduced 

 as the synonymy of Ranzania Ito. 



Plate I. Fig. i : plant in nat. size. 一 Fig. 2 : upper portion 

 of branch showing filiform and flat segments, f . — Fig. 3 : portion 

 of the cross section of frond, ^―. ― Fig. 4 : portion of the 

 longitudinal section of frond, ― Fig. 5 : terminal portion of 

 branch, や 一 Fig. 6: cross section of branch, や 一 ト lg. 7: one 

 of sporophylls bearing tetraspores, き. 一 Fig. 8 : cystocarps, - Y. 



