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A. Muciferous lacunas present in root, stipe and lamina. 



L. japonica Aresch. 

 L. longipedalis sp. nov. 

 L. gyrata Kjellm. 

 L. radicosa Kjellm. 



B. Muciferous lacunas present in root and lamina, but not in 



stem. 

 L. angusta Kjellm. 

 0. Muciferous lacunas none at all. 

 L. peterseniana. 



Laminaria japonica Aresch. 



Many authors have frequently described this species and much has 

 been written about this plant in particular. Notwithstanding, I am here 

 to add some remarks on the variation of shape of frond and of the 

 existence of lacunas muciferas. 



The present plant has a rather wider range of distribution within the 

 compass of our empire. Its southern limit is Iwaki and its northern 

 Etrofu, as far as is known to me. All the coast around the Hokkaido, 

 that is the ancient Iesso, has more or less altered forms of this species. 

 It attains its maximum size and its luxuriant growth in the locality 

 surrounding Hakodate. The western coast of Hokkaido, that is the coast 

 extending from Cape Soya down to Otaru is fringed with one and the 

 same variety. Its range of distribution being rather wide, it, as a con- 

 sequence, varies somewhat in its form and structure. 



Generally we may distinguish two forms in this species, viz./. typica 

 and /. angusta. Between these two forms there are gradual transitions 

 from one to the other. 



/. typica. This is the larger one which has been several times 

 collected and so fully described by many authors that no further descrip- 

 tion is needed. It has larger and broader lamina and firmer and longer 

 stipe than /. angusta. Muciferous lacunas are present in root, stem and 

 lamina. The substance varies somewhat in consistence. 



/. angusta. This is shorter and narrower than /. typica.. Stipe is 

 slender and short. Lamina is linear-lanceolate slightly undulated at 

 margin with cuneate or ovato-cumMte base and with more or less distinct 



