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distantly dichotomous below, gradually becoming nearer above, strongly 

 forcipated inward at apices, sometimes emitting short lateral ramuli and 

 often root-fibres at geniculus. The articulations are 5-10 times as long as 

 diameter, interstices pellucid, and with cells round the geniculus slightly 

 prominent in the lower portion. Cortical cells at geniculus are sometimes 

 small and numerous, sometimes larger and less numerous. -In one of the 

 dried specimens I have seen telrasporcs, 2-3 of which are verticillately 

 arranged on one side and not much prominent, roundish and tripartite. 

 Cystocarps unknown. Colour light pinkish red, often almost colorless. 

 Substance soft and the plant closely adheres to paper in drying. 



-Hab. : Mostly entangled on Sargassuw in calm places between 

 tide-marks near high tide. Common along the both coasts of Honshyu 

 and Kyushu ; Fusan. 



Hitherto I have passed in calling the present plant in the name of 

 Ceramiuin gracillinntm Griff, and Harv. after De Toni I.e. But on 

 making study by comparing with a specimen lavelled C. gracillimum 

 collected and determined by A. D. Cotton at Bovisand in 13, 9, 1905 

 (which is kept in the herbarium of Tokyo Imp. Univ.), I have 

 found that our plant is quite different. C. gracillimum has dark reddish- 

 brown colour, more erect apices, and more regularly alternate ramuli 

 which are not widely spread out but rather standing nearer to one an- 

 other. Moreover its filaments are much thicker than in the present plant 

 which is capillary-fine and it has more or less traceable main stem or 

 main branches. 



PI. CLXXIX, Fig. 1-7. Fig. 1 : small mass of Ceramiuin lenerrinntm 

 (Mart.) Okam., \. Fig. 2: portion of frond, y .Fig. 3: lower articula- 

 tions, -^-. Fig. 4: apical portions of ramuli shooting forth colourless 



^(LIBRARY 



