On the Algae from Ogasawara-jima (Bonin Islands). 



' ' By ; . 



K. Okamura, Rigalcuhakushi. 



With PI. VI. 



FLORIDEAE. 



Helminthocladiaceae . 



Liagora Lamour. 

 Liagora viscida (Forsk.) Agardh.—J. Ag. Sp. Alg. II, p. 425; III, 

 p. 518.— Hauck Meeresalg. p. 63, fig. 21a. 



Hitherto known from : The Mediterranean Sea and the warmer 

 part of the Atlantic Ocean ; Tasmania and New Holland. 



Chaetangiaceae. 

 Galaxaura Lamour. 

 Galazaura lapidescens f. villosa.—Reyd. Ost-Asien, p. 292.— Id. 

 New Guinea. — J. Ag. Sp. Ill, p. 530. 



Hitherto known from : The warmer part of the Atlantic Ocean 

 at Canary Island and America ; Friendly Islands ; New- 

 Holland and New Guinea ; the Indian and the Ked Sea ; 

 Riukiu and Formosa. 



Galaxaura fragilis (Lamk.) Decsn.—J. Ag. Sp. Ill, p. 527. 



Hitherto known from : k Warmer Sea ; West Iudies and the 

 Red Sea. 



Remarks : In referring my plants to this species I must here make 

 some remarks on my identification. My plants have flabellately dicho- 

 tomo-fastigiate semicircular frond, with terete segments. Segments are 

 almost cylindrical, very slightly broader beneath forks, scarcely 1 mm 

 broad in diameter, 4-6 times as long as diameter, constricted at base 



