March, »16.] x. YENDO.— NOTES ON ALGAE NEW TO JAPAN. VI. 



79 



This is the most predominating form of Iridsea on the coasts 

 of northern Japan. Consequently, the greater part of the dried 

 iridsea in the markets belong to this variety. The illustration of 

 the plant given by Po tels and Ruprecht, I.e., shows a larger 

 extreme among the type specimens in the Herbarium of the 

 Academy of Science of St. Petersburg. Kjellman's f. parvula is 

 described on an average form (fig. 1), and Iridasa phyllocarpa 

 V. et R. is described from a second-year form of this plant with 

 the older frond withered on the margin and new foliages proli- 

 ferating from it (fig 2). 



Locality. Coasts of Northern Japan. 



Distribution East coast of Kamtchatka. 



\n average form •■> n willi f. parvula Khi.i.m. 



In oal i'. . 



