36 



Eab. In deep water. Sagami, Boshu. 



Remarks : The plant differs from Amansia multifida in its 



external habit,, colour and size. Also the pinnae and especially pinnulae 

 are not so regularly alternate as in the latter species, but scattered and 

 often 3-4 arranged together on one side, and are not so close to one 

 another as in the latter. The stichidia, again, are longer than those of 

 a specimen of Am. multifida from Brazil in my possession. They are 

 very narrowly linear measuring 3-5 mm. in length. Moreover, the length 

 of cells of the frond, that is, the breadth of the zones, is quite different 

 in these two plants. The cells measure in length 80-115 // in Am. 

 multifida and 92-280 fi or perhaps even more in the present plant. On 

 account of these points of differences between the two plants, I can not 

 completely endorse Mr. Holmes ; view that " the Japanese variety of this 

 plant does not present any very marked characters to separate it from 

 Am. multifida, although the colour is quite different." Nevertheless, I 

 cannot but admit that the plant in question stands very close to Am. 

 multifida. 



Herposiphonia fissidentoides (Holmes). Fig. 9-11. 



Syn. Folyzonia fissidentoides Holmes I.e. no. 22 t. XII. f 2 

 a-b. 



This pretty plant has been first described by Mr. Holmes from 

 materials collected at Enoshima by Mr. S. Okubo. After carefully study- 

 ing the fructified specimens, I have been led to refer this species to 

 Herposiphonia, and not to Polyzonia as Mr. Holmes has done. 



Frond : At first glance, the plant appears to have a habit remarkably 

 resembling that of Polyzonia. But on closer examination, even of sterile 

 frond, the " Langtriebe " distinctly arise alternately from every fourth 

 articulation ; and the " Kurztriebe," which are flat and leafy, stand almost 

 horizontally in double rows along the upper side of the decumbent stem, 

 giving a dorso-ventral appearence for the plant. The latter arrangement 

 of the " Kurztriebe,' ; however, is rather obscure ; for, although the leaves 

 (i.e. " Kurztriebe ") are in reality inserted on the dorsal side of the shoot, 

 yet they spread out very widely on both sides, and appear to lie ap- 

 parently on the same plane as the " Langtriebe. ,J 



Leaves: The form of the leaves varies from ovato-lanceolate to 

 oblong, ending in a broadly acute apex with a tapering or constricted and 

 oval base. The broader leaves slightly overlap one another with their 



