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the dorsal median line of every young segment, for instance of 

 marginal teeth, a single row of dichotomous "hair-leaves" is 

 longitudinally arranged. The cortical and inner cells covering the 

 midrib portion of the upper part of a branch are elongated, while 

 those of the remaining portion are irregularly polygonal. On the 

 cross-section of frond through the midrib 5 pericentral cells are 

 observed, of which the unpaired one stands on the ventral side 

 and the paired ones on both flanks. Colour vinoso-red. Substance 

 membranaceous and the plant does not adhere to paper in drying. 



Hab. : Oshima (Prov. Satsuma). 



PL. CXXXI. Fig. 1 : frond of Vidalia obtnsiloba (Mert.) J. 

 Ag., \. Fig. 2 : apical portion of a branch viewed from the vent- 

 ral side, ^. Fig. 3 : cross-section of the lower portion of a 

 branch ; the upper side, dorsal ; the lower, ventral, ^. Fig. 4- : 

 midrib of Fig. 3 magd.; a, the central axis ; d, the unpaired peri- 

 central cell standing on the ventral side; b, c, e,f, paired pericentrals 

 standing on flanks, - 9 1 1 . Fig. 5 : cross-section of a upper branch 

 bearing a thin midrib; characters same as Fig. 4, - 1 * 5 . Fig. 6: 

 cross-section of a branch showing a vein, v, arising from the axis 

 a, J J-. Fig. 7: surface-view of cortical and infra-cortical layers 

 over the midrib, i-JA Fig. 8 : surface-view of the cortical layer 

 of membranous portion, i-JA Fig. 9 : inrolled apex of a branch 

 unfolded, j . Fig. 10 : laciniae of a marginal tooth, Y- F'&- H : 

 lacinia of a marginal tooth showing "hair-leaves," //, //, "j- Q . Fig. 

 12 : one of laciniae magd., ^p. Fig. 13 : hair-leaf, *-<>. Fig. 14 : 

 some of laciniae of a marginal tooth transformed to stichidia, ~p. 

 Fig. 15: stichidium, marked a in Fig. 14, magd., | 



