July, mo.] YESDO.— NOTES ON ALGM NEW TO JAPAN. WL \\:\ 



parts of frond fine and delicate, exactly answering to P. recur- 

 yatum Okam., while the lower part of the same frond is broad 

 and robust, showing all characters of the present species. 



Localit}-. Rikuchu Prov. (!) ; Rikuzen Prov. (!), (Mrs. 

 Wainwright, No. 38, 50-56, 63) ; Hitachi Prov. and Kazusa 

 Prov. (Okamura) ; Boshu Prov. (!) ; Shimousa Prov (!); Sagarni 

 Prov (!), (Herb. Imp. Mus. No. 124); Izu Prov. (Herb. Imp. 

 Mus. No. 125) ; Shima Prov. (!). (Herb. Imp. Mus. No. 93) ; 

 Awa Prov. (!); Hizen Prov. (K. Ukabe, No. 60); Botel Tobago 

 (Dr. T. Kawakami, No. 14) ; Wakasa Prov. [R. Tsuge, No. 

 110) ; Uzen Prov. (Sato, No. 54) ; " Common along the coasts 

 of the Pacific and the Japan Sea in warmer parts of the country" 

 (Okamura). 



Distribution. Mauritius ; New Zealand ; Tasmania ; New 

 Holland. 



Plocamium leptophyllum Kutz. mut. limit. 



Spec. Alg. p. 885.— J. Ag. : Spec. II, p. 405.— Id. : Epicris, p. 33S. 

 (excl. var.) 



=P. hamatum J. Ag. : Epicris, p. 338.— Id. : Anal. Alg. p. 94.— De 

 Toni : Syll. Alg. IV, p. 589. 



The present species has some resemblance with P. coccineum 

 Lyngb. and its specimens may be found in various herbaria 

 under the latter name. Both are, however, easily distinguished 

 by the number of the indefinite branches in an internode be- 

 tween the two consecutive definite branches. In the former, 

 there are generally three, but in the lower parts of frond, two 

 or one ; in the latter, there are invariably two. 



The authentic specimens of P. leptophyllum Kutz., as far 

 as I have seen in Berlin, Dublin and Eerbeek, appear to be a 

 mixture of two different species in my conception. Some of 

 them have two indefinite branches (ternis), and others have 

 three indefinite branches (quinis), above one simple definite 

 branch in an internode. The specimens under P. leptophyllum 

 Kutz., exclusive of varieties, in the Agardhian Herbarium, are 



