1 84 

 eated or roundish and narrower than the central cells. In a longa- 



O *^* 



ttidinal section they are seen to be short and irregular, and 

 they form a distinct broad sheath enclosing the long internal cells 

 in older portion of frond. In younger part the subcortical layer 

 consists of only one or two layers of short irregular cells. The 

 lono- internal cells of the frond are all of much the same dia- 



o 



meter, and a transverse section shows them to be much more re- 

 gular than those of Chordaria flagettiformis PL. XC. All the 

 cell-walls of the axile cylindre are thick and show distinct pits, 

 but those of the subcortical layer are somewhat thicker than the 

 central ones. By the decaying of the central elongated cells a 

 large cavity is sometimes produced. The assimilatory filaments 

 are as usual as in the Chordarian plants ; some irregularities are 

 observed in its branching as shown in the fig. 10-11. The frond 

 is firm and tough and a little gelatinous in well grown plant, but 

 in some soft and more gelatinous, especially in younger ones. The 

 firmer fronds do not adhere to paper when dried but softer ones 

 closely. Colour yellowish brown turning to black when dried. 



Hab. : On rocks between tide marks extending to 1-2 

 fathoms. Amakusa Isl., Provs. lyo, Awa and Ise ; Saku-no-shima 

 (Prov. Mikawa), Provs. Ril .^.cn, Rikuchu, and Rikuoku ; Provs. 

 Idzumo, Wakasa, Noto, Yechigo, and Sado ; Mashike (Hokkaido) ; 

 Karuto (Chosen). 



The present plant is most nearly related to Chordaria flagel- 

 liformis Ag. in the substance and external appearence ; but it 

 differs from the latter in being more or less distinctly tubular and 

 possessing a broad Land of subcortical cells. In the latter the 

 longitudinal cells are of irregular size while in the present plant 



