March, 1916.1 NOTES ON ALGAE NEW TO JAPAN. VI. 77 



distinct from a smaller form of G. furcellatus J. Ao. from the 

 Peruvian coast. 



Localit\*. Amakusa (D. Kobayashi, No. 256) ; Shima Prov. 

 (Herb. Imp. Mus. No 10); Shimoda(!) ; Same Harbour (N. 

 Takahashi) ; Hidaka Prov.(!) ; Muroran (N. Takahashi) ; Ugo 

 Prov. (Y. Kudo) ; Echigo Prov. (T. Obara, No. 17 ; R. Koba- 

 yashi, No. 28 ; M. Nakamura, No. 83) ; Hiuga Prov. (T. Ito, 

 No. 28). 



Distribution. California. 



Iridaea laminarioides Bory. 



The first species of Iridaea, I. laminarioides, has been de- 

 scribed by Boky in 1828 on a material from the Pacific side of 

 South America. Several species have been later on added by J. 

 AgaRDH, Suhr, Harvey, etc., from California, Cape Horn, Cape 

 of Good Hope and New Zealand. In 1840, the gigantic book 

 of Postels and Ruprecht appeared in which they described 15 

 " species " of Iridaea as new to science, all from the North 

 Pacific. Thus a considerable number of Iridaea species have been 

 assigned to the whole range of the Pacific coasts of North and 

 South America. Prior to these reports, in 1S09, TURNER has 

 already described a plant, much resembling to /. laminarioides 

 BORY, under Fucus cordatus from a collection by Menzies on 

 Banks Island, British Columbia. Ruprecht seems to have 

 passed over Turner's description until his Tange des Ochot. 

 Meeres has been printed. This is understood from the facts that 

 his handwriting reading " Iridsea cordata (Turner ?) " is found 

 011 ,-1 label attached to a specimen collected by Wosnessensky 

 in 18 \~) and that nothing is stated about the specimen in his 

 paper just alluded to. The specimen, indeed, is hardly distincl 

 from the type of 7. cornucopiaj P. et R. 



In 1851, ]. Agardh arranged all the then known species oi 

 Iridsea in hi> Species Genera el Ordines Floridearum. In it he 

 mentioned Fucus cordatus Turn, as a valid species under Iridsea 

 and gave .'i suitable generic position for, or expressed his opin 

 ion on, e.'icli of the described member. Still, the descriptions 



