44 



acute with ultimate divisions much acuminated like teeth. 

 Margin in some specimens is quite flat and entire or little 

 provided with teeth," in others slightly serrated. In ours, the 

 surface is mostly free from proliferations, but in one or two 

 specimens a few, small, short, denticular processes are 

 emitted. The form, ramification and size of fronds are 

 much varied according to the specimens. No fruit seen in 

 ours. The interior of frond is less densely traversed by 

 filaments and is somewhat tubular, externally covered by a 

 cortical layer consisting of 5-6 rows of cells. Colour a bright 

 pinkish red, soon discharged in fresh water in decomposi- 

 tion, as it is seen from the decaying of colour into greenish- 

 yellow as well as from red coloring of paper on which the 

 frond is mounted. Sub&tanci thin and very soft gelatinous. 

 In drying the plant most closely adheres to paper. 



Hah.: Ryukyu Isl. (Okinawa), Bo (Prov. Satsuma). 



On comparing with Halynicnui fonnosa Harv. the present 

 pi -.'.lit is much thinner in substance, much lighter in color, 

 much more dentate rather than spinose and ramification is 



more pinnate. 



PL. CLXII, fig. 1-3. Fig. 1 : frond of Halymenia Har- 

 ' ( ytina J. Ag., ]-. Fig. 2: cross-section of frond, 4 1 S . Fig. 

 3 : portion of the cross-section, 3 ^ 3 . 



