89 



median fascia. The base of broader forms is more ovate than that of the 

 narrower ones. Lacunas are always present in root and stem ; but those 

 in lamina are sometimes absent or very difficult to detect. It is more 

 especially so in southern forms such as are found along the coast of Iwaki 

 and Iwashiro. 



/. angusta is more widely distributed than /. typica, mainly along 

 the coast of the Hokkaido. Almost all Laminaria japonica found along 

 the western coast of the Hokkaido consists of plants of this form. 



Great many examples of L. japonica has been brought to me from 

 several localities, but none from any point beyond the south-west ex- 

 tremity of the province Iwaki. Notwithstanding, we find mention of 

 collections of this species in other parts, e.g. Dickie 13 found it at Oshima 

 harbour, southern coast of Japan. Such a plant may perhaps be a 

 different species. Again Hariot 2) mentions L. flexicaulis as has been 

 collected at Yokosuka. It may be said with certainty, that it is a different 

 species. 



Laminaria longipedalis Okam. nxser. PL VII. Fig. 1—3. 



Root consists of several-times dicrotomously branched clasping fibres, 

 extending from the lower end of stem in a conical form and attenuated 

 toward the extremity. In a cross-section we find a ring of muciferous 

 lacuna3 situated just beneath 'the cortex. 



Stem is almost cylindrical below, compressed and becoming flattish 

 upwards where it expands into the base of a terminal simple lamina. 

 In drying, stem becomes much flattened, but reassumes its original form 

 on reimmersion in water. In a cross-section of stem the medullary 

 layer is transversely elliptical, becoming more and more linear as the 

 stem increases in diameter. In the cortical layer a more or less close 

 ring of small roundish muciferous laeunse is detected (Fig. 3). LacunEe 

 are situated so near ,the periphery that they are separated by the thick- 

 ness of only 4 — 5 cells from the periphery. The plant seems to be 

 perennial, as, in a cross-section of stem which has a length of 50 cm, 



1 ) Bicltie — Notes on Algae collected by Moseley of Challenger, &c. — Journ. Lin. Soc- Vol. 

 XV, No .87. 



2) Mario* — List. d. Algues Marines p. 217. 



