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frond is that of the generic type and the cells are firmly coalesced. 

 Fruits of both kinds are formed in ultimate segments and pro- 

 liferous ramuli. Tetraspores forming a subsorus in the median or 

 terminal portion of ramuli, oblong, immersed among cortical fila- 

 ments. Cystocarps here and there scattered in a few groups in 

 terminal portion of frond and in proliferations. They are not found 

 in older and lower segments. Colour dull purplish-green, becoming 

 greenish-yellow. Substance cartilaginous, becoming firmer in drying. 

 Plants do not adhere to paper in drying. 



Hab. : On rocks near high tide. Provs. Idzumo, Wakasa 

 Tango, Noto, Yetchu, Yechigo, Uzen, Mutsu, Rikuchu, Rikuzen. 

 Fruits. : July October. 



Affinities : The many times dichotomous frond of the present 

 plant induces us to think of its relation with Gratetoupia dictotoma 

 and by that characters it may be referred to the section Chondro- 

 phyllum. With Gr. filicina, on the other hand, the present alga 

 shows some relations, for there is, in some specimens (as I have 

 illustrated in the larger one of the two figures in PI. CXVI), a 

 very close resemblance in appearence between the two species. 

 In such specimens, the frond is very much elongated and remains 

 for a greater lengths simple ; then once or twice forks at longer 

 distances, and the segments from the base to apical portion are 

 beset on both sides with proliferous very elongated, simple or 

 distantly forked horizontal distichous branches, either naked or clothed 

 with lesser sorts of ramuli. One may easily take such forms for 

 Gr. filicina, though dichotomous ramification is rarer in case in 

 that species. The substance, however, is firmer and more cartila- 

 ginous than Gr. filicina, and moreover, even in those specimens 

 which have an appearence like that plant, tetraspores are collected 



