Dictyota dentata Lamour. 



Norn. Jap. : Toge-amidzi. 

 PL. CXXIX, Fig. 1-4. 



Dictyota dentata Lamour. Diet. p. i J ; Kiitz. Sp. Alg. p. 556; 

 Id. Tav. Phyc. IX, t. 35 f. i ; J. Ag. Sp. Alg. I, p. 96; Id. Till Alg. 

 Syst. V, p, 98; Id. Anal. Alg. I, p. 17; De Toni Syll. Alg. Ill, p. 

 268 ; Hauck et Richter Phykotheka universalis no. 669. 



Only one specimen now before us. Frond stupose from the 

 base, even up to 9 cm. above the root, 15 cm. high, 3-4 times 

 decompound pinnate in an alternate manner. The outline of primary 

 branches or pinnae somewhat ovate and that of pinnulae lanceolate 

 which are similarly pinnated with simple or divided pinnellae whose 

 margins are furnished with minute teeth. Branches of every order 

 are slightly flexuose. Our specimen has branches very much twisted, 

 probably owing to the effect of bad preparation. A few proliferous 

 segments have been observed at the lower portion of frond, about 

 5 cm. above the root. Colour greenish brown. Substance mem- 

 branaceous. 



Hab. : Ryukyu Isl. 



I have studied several reliable specimens such as Hauck et 

 Richter I.e. and one from Jamaica determined by Mr. Borgesen, also 

 another one from Port Antonio sent from Prof. Farlow. 



PL. CXXIX, Fig. 1-4. Fig. 1 : frond of Dictyota dentata Lam. 

 in nat. size. Fig. 2 : pinna that is primary branch, \. Fig. 3 : 

 pinnulla and its portion, f . Fig. 4- : proliferous segments at the 

 place about 5 cm. above the root, \. 



