39 



Hab. : Probably near low tide. Riu-kiu Isl. ; Amakusa Isl., 

 Aburatsu (Prov. Hiuga), Prov. Tosa, Wagu (Prov. Shima). 



Fruits : summer. 



Remarks : In our plants we find sessile cystocarps formed on 

 the side of pinnulae in ovate shape (Fig. 6). 



PL. LX, Fig. 1-6. Fig. 1 : sporiferous frond of Laurencia con- 

 cinna Mont., \. Fig. 2 : branch, \. Fig. 3 : cross-section of a 

 branch, ^. Fig. 4; tetrasporic branch, f. Fig. 5: surface-view of 

 a sporiterous pinnula showing cover-cells, d, -*--. Fig. Q : branch 

 bearing cystocarps, - . 



Laurencia concinna Mont. 



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