Aug. wis.] NOTES ON ALGAE NEW TO JAPAN. 177 



seasons in many parts of Japan, I 1] could reduce them to 19 

 species. One and the same plant has been passing under 

 several separate specific names, one being based on the upper 

 part of frond and the other on the lower part. Male and 

 female form have had different names ; young and old form 

 have had a specific position for each ; and vegetative and fertile 

 form have stood for many years as two valid species. I have 

 reasons to say that a similar example, however in less degree, 

 may be met with in other families. 



In the present Notes the reader might have surprised to 

 find near^' 38 species of algae hitherto regard as common in, 

 but peculiar to, the Atlantic or the Mediterranean coasts to 

 have occur in Japan also. Some of them are found pretty 

 distributed on the coasts of Japan, and some, known widely 

 at only limited localities. 



It was a very interesting discovery to algologists as well 

 as to plant-geographers that Bonnemaisonia hamifera Hariot, 

 formerly known as indiginous species of Japan, has been found 

 on the Atlantic coast of France and on the south-western coast 

 of England 2 ^ ; and that Biddulphia sinensis Grev., a diatom 

 peculiar to the Pacific coast of Asia, has suddenly made its ap- 

 pearance in the North Sea in the year 1903. These examples 

 are regarded by the authorities as resulted from the Euro- 

 Asiatic navigations. The algal flora of Japan were practically 

 unknown when the European steamers have commenced their 

 regular calls to Japan. In 1895, Dk Toxi 1 enumerated 299 

 species of the marine .algae, excluding Cyanophyceae and Bacil- 

 lariaceae, as known from Japan. In 191(5, Okamuka counted 

 them '),"o. His list includes some manuscript names and ex- 

 cludes many imperfectly reported species . As far as 1 could 



1) Yehdo: Fucai Japan. (Journ. of the Coll. Set, [mp. 1 Hi.. Tokyo. 



Vol XXI. Wi. 12.) 1907. 



2 It. 1 11-: Bonnemaieona, a naturalized Japanese Beaweed, (Trans. Nat. 

 II. iw. Vol, VI, V s. Part III.) 1902. 



id: On the Immigration of Biddu phi Grev., &c. (Med- 



delelser Komra. Uuvnnd Plankton, B I. I. L9I 



1 I >. 1 1 : PI 1 '. >ys», &c. 189 i. 



Ok \mi i- I : Nippon S rui M.- i i, Ed. I I. 



