194 THE BOTANICAL MAGAZINE. [Vol.. xxxi. No. 367. 



Phyc. Ill, p. 19, Taf. 60, fig. 3 (under C. macropus). — De Toni : 

 Syll. Alg., I, p. 267. 

 ? = Chaetomorpha pachynema Mont. : in Kutz. ; Spec. Alg., p. 379. 

 —Id.: Tab. Phyc. III., p. 19, Taf. 60, fig. 1.— De Toni : Syll. Alg. 

 I, p. 270. 

 = Chaetomorphopsis paciBca Lyon: in Tilden ; Amer. Alg., No. 

 458. 



This species has been reported by Martens to have been 

 collected at Yokohama. But we have never found any specimen 

 referrable to it at Yokohama or elsewhere on our coast. Its 

 occurrence in Japan was hence left in doubt among us. On 

 examinating Martens' specimen in the Herbarium of the 

 Botanical Museum of Berlin, I have ascertained it to have 

 been resulted from his erroneous determination of C. crassa 

 Kutz. The species, therefore, had to be striken out from the 

 floristic list of Japan. I have now to report its true occur- 

 rence within our boundary, though at an island at a good 

 distance from the main part of Japan. 



The fine annulation at the basal part of frond has been 

 noted by Borgesen with illustration. In our specimen it is 

 very well marked, although quite obscure in some shoots. The 

 basal cell of frond measures 8-10 mm in length, and the upper 

 ones, flaccid, 1J-2 times as long as diameter. De Toni remarked 

 on C. paciRca Kutz. that it " videtur C. antenninae (Bory) 

 Kutz. peraffinis et vix articulorum forma diversa." Collins 

 united the two into one without hesitation. The original 

 specimens of the two species in the Botanical Museum of 

 Berlin are indeed inseparable from each other. The length of 

 the basal cell is by no means specific. 



Chaetomorphopsis paciGca Lyon is without doubt to be 

 synonymized under the present species. 



Very probably, C. pachynema Mont., illustrated in Kutz- 

 ing's Tab. Phyc. Ill, Taf. 60, fig. 1, may be also reduced to 

 a synonym of this species. The thick cell-wall and enormous 

 length of the basal cell, the size and the flaccid membrane of 

 the upper cells, all characteristics of the present species, are 



