142 



and roundesh axils, attaching to each other and to the substratum 

 by emitting root-tufts from the undersurfaces, of deep greenish 

 colour. Utriculi almost cylindrical, subtruncated at apex and 

 slightly narrowed a little beneath the top, 50-66 n broad, about 

 366 n long, 5-6 times as long as broad ; utriculi of the undersurface 

 having a very thin wall at the top, those of the upper side a 

 little thickened and those standing at the corner or margin thicker 

 than those of the upper. 



Hab. : On rocks below low tide. Provs. Boshyu and Sagami. 



Descrip. : Fronds decumbent measuring some 10 cm. or more 

 in extension, with broader segments, 5-10 mm. or more in breadth 



I 



3-4 mm. thick, which are parted with a patent axil, closely coa- 

 lesced to each other by short tufts of reot filaments emitted from 

 the under-surfaces of segments, with glabrous surfaces on both 

 sides. Utriculi are generally slightly constricted a little beneath 

 the apex. This character, however, is not strictly followed ; for, 

 in one and the same frond some are not constricted; but subtruncat 

 ed character is almost uniform. Utriculi branch near their bases 

 close to each other after the manner of Codium adhaerens so as 

 to form a dense compact layer and to extend side by side rather 

 than to increase in thickness. Utriculi of both upper and lower sur. 



faces are not much different in the thickness of the terminal wall 



i 



but strictly speaking those of the upper side is a little thicker 

 than those on the lower ; those standing at the corner or margin 

 of frond have a thick wall at top, but not too much thickened 

 like crescent. Colour deep green. Substance rather firm becoming 

 somewhat coriaceous when dried and the plant does not adhere 

 to paper in drying. 



