~ 137 



De Toni Syll. Alg. Ill, p. 428 ; J. Ag. Till Alg. Syst. II, p. 75 ; ft] ft, 



#36 Si 5! p- 123. 



Frond filiform and often entangled on the frond of Sarpassum. 



O o 



3-4 times equally branched in an alternate manner from the base, 

 here and there with dichotomous branches, about i mm. thick at base 

 gradually narrowing upward and the plant attains 30 cm. or more in 

 length. Branches and branchlets very soft and pliable, ascending or 

 widely diffused and flexuose in various directions with short ultimate 

 ramelli patent and approaching. Frond is more or less hollow, 

 internally consisting of elongated broader cells which are somewhat 

 loosely coalesced. Longitudinal growth of the frond is performed 



by the horizontal division of subterminal cells, and the assimilatory 

 filaments are subsequently formed as lateral outgrowth. Assimila- 

 tory filaments simple or branched, short and filiform, slightly torulose, 

 somewhat becoming thicker toward extremity and a little curved 

 above. Colorless hairs very abundant, especially so in younger frond. 

 Unilocular sporangia oblong formed at the base of an assimilatory 

 filament. Pleurilocular sporangia filiform, consisting of one row of 

 cells, and are transformed from the assimilatory filaments. Colony 

 olive-brown. Substance slimy and the plant firmly adheres to paper in 

 drying. 



Hab : On the frond of Sargassum between tide marks or near 

 the low tide ; in calm places. Prov. Shima, Mikawa, Boshyu, Sado, 

 Noto, Yechigo, lyo, Hizen, Hoki, Tango. 



Suringar mentions that the present plant grows on rocks ; but 

 as far as we know it always grows on the frond of Sargassniu, and 

 never on stones or rocks. From his illustrations the plant described 

 by him does not seem to differ from the present plant which has been 

 suspected by J. Agardh from its strrcture to belong to the present 

 genus. The plant in question is widely used among us as an edible 

 substance. 



