69 



throughout or polysiphonous tit base for a short distance, pointed at 

 apex, sometimes branched with finger-like ranuili at apical portion (Fig. 

 13); some of pinnae develop into branches afterward. Branches nre 

 more or less corticated except very young portion near apex ; the cortica- 

 tion begins as rhizoids from pericentral cells, and afterward thickly covers 

 the 4 or 5 pericentral cells. In surface-view of thicker branches cortical 

 cells are linear and longitudinally arranged. Length of the articulations 

 subequal to or one half to twice as long as the diameter. Slichitlhi 

 lanceolate, provided with a rnonosiphonous pedicel, and arise either from 

 monosiphonous or polysiphonous base of pinnae or pinnulae, often 2 or 

 3 aggregated. Cystocarps globular or ovate shortly pedicelled and a 

 little prominent at apex. Colour pinkish red. Substance soft and closely 

 adheres to paper in drying. 



Hah. : Washed ashore ; lyo, Rikuzen, Yechigo. 



All the species of this genus hithertoknown have branches arising 

 generally from every second node, never from every node, as in the 

 present plant. 



PI. CLXVII. Fig. 1 : frond of Ht'terosifi/fjiiia jafirjnica Yendo, 

 i- Fig. 2 : portion of branch (having 5 pericentral cells), showing 

 pinnae arising from the dorsal side of branch, the beginning of rhizoidal 

 cortication, and stichidia arising from monosiphonous pinnae, ^ . Fig. 

 3-5 : cross-sections of different parts of branches of different plants, 

 4 X 8 , 3 * , Y , respectively. Fig. 6 : rhizoidal cells on the surface of 

 main branches on the lower portion of frond, 2 ^. Fig. 7 : growing 

 portion of branch showing sympodial growth of frond ; a, apical cell, 

 3 j 3 , Fig. 8; cystocarpic branch having 4 pericentral cells; a, />, forked 

 and monosiphonous pinnae ; c, branch of indefinite growth, forked and 

 polysiphonous at base. n * , Fig. 9: polysiphonous portion of c in 



