Feb.. imj YENDO.— NOTES ON ALG^ NEW TO JAPAN, LV. (55 



Rhodochorton Rothii Naeg. 



Beitcr. z. Morph. u. System. Ccram. \). 355.— Dii Toni: Syll. 

 Alg. IV, !>. 1407.— KjELLM.: Alg. Arct. Sea. p. 185.— Borgesen: 

 Mar. Alg. Faeroes, p. 390, fig. 61-65. — Collins, Holden and 

 Setch.: Phyc. Bor.-Amer. No. 49, Fasc. C. No. LVI.— Collins : 

 Mar. Alg. Vancouv. Island, p. 127. 



(for other referrences, see: De Toni, I.e.). 



The present species, so widely distributed in the colder 

 parts of North Atlantic, as well as in the north-western coast 

 of North America, has not been known from our country. But 

 it is not uncommon on the Pacific coast of middle Japan. 

 Thus the species may now be counted as one of the cosmo- 

 politan marine algae. 



Locality. Shimoda, Izu Prov. (on Sargassum heimphyllutn 

 J. Ag.) (!); Misaki, Sagami Prov. (on Codium mucronatum 

 J. Ag.)(!). 



Distribution. Norwagian polar sea ; Spitzbergen ; Iceland ; 

 Greenland; Mediterranean Sea; Adriatic Sea; West coast of 

 North America, from Alaska to Puget Sound. 



Sapporo, Jan. 1916. 



