, io6 



Our plant so well agrees with the description given by the 

 authors of this species that no further description will be needed. I 

 have seen 4-6 branches arising from the same node in making stellate 

 ramification ; but, it is more usual to find the case as illustrated in 

 PL. LXXX, fig. 10. 



Hab. : On the fronds of various algae. Riukiu-Isl. 



PL. LXXX, Fig. 8-12. Fig. 8: frond of Miecrodictyon pseitdo- 

 hapteron A. and E. S. Gepp, somewhat torn, \. Fig. 9 : lower 

 portion of the frond, with root-fibres, r ; (diameter of thicker cells 

 measures 410,0.), \-. Fig. 10: stellate node, showing 2-cells hav- 

 ing tenaculoid attachments applied to the cell of the main filament, 

 ? j 2 . Fig. 11 : tenaculoid attachments which hold the reticulum toge- 

 ther, ~. Fig. 12 : tenaculoid attachment, ^-. 



Microdictyon Decaisne 1839. 



ft i <* 3 m- 



CLADOPHORACEAE, SIPHONOCLADIALES. 

 Hi C 3 ?4, & i' !> If S- 



Wt s'. f ^ *rft^t," 



^A'IW**^ B m > ss^ 



J ^ 7 t ^. ffi / file S / * ^ - II 



Pi, K ilil J II m - & *, ^ 55 $ ju 



; fifi, M. umbilicatum (Velley) Zanard. 



