﻿PLATE XII. 



Isoptera Gen. nov. 



LOPHOTHALIE>E (Rhodomelaceae). 



Isoptera : Frond filiform, compressed, 2-3 times alternato- 

 pinnate, distichous, throughly corticated, with patent branches 

 which are furnished with pectinated, monosiphonous, coloured 

 li Haarbldttem " al ten ally arising in twos on both sides (only 

 denuded in the lower portions). " Lang trie be " developed from 

 upper one of the two consecutive " Haarblattern." Mode of 

 growth of shoots is monopodia! with a subobliquely articulated 

 apical cell whose successive articulations soon give rise to paired 

 " Haarblattern." Pericentral cells 4 in number, more or less 

 thickly corticated. Tetraspores formed in upper swollen portion 

 of slightly twisted, stichidia-like, short " Langtriebe " which carry 

 simple "Haarblattern," usually in pairs in each articulation, making 

 cross-way to each other. Procarps produced on the upper side 

 of the lowest or next cell of the rachis of mostly simple " Haar- 

 blattern " which are developed near the growing apices of shoots. 

 Cystocarps globular with more or less prominent carpostome, almost 

 sessile or provided with a very short apparent pedicel. 



Isoptera regularis Sp. nov. 



Norn. Jap. Hiyohi-sd. 

 Characters same as those of the genus. 



Hab. Perhaps in the deep waters. Enoshima and Misaki 

 (Sagami). Fruits ― Spring. 



