tliey are almost uniform. From Chordaria Cladosiphon Kg. p. 

 1 66, PI., CXLIV, the present plant may be distinguished by firm 

 and coriaceous substance (in older fronds and older portions of 

 a frond), by alternate mode of branching, by densely compacted 

 strata and by having more or less thick subcortical sheath. 



PL. GXLIII. Fig. 1 : two fronds of Chordaria fir ma E. S. 

 Gepp from Prov. Sado, July, \. Fig. 2 : frond of the same from 

 Oshima, Prov. Rikuzen, August, \. Fig. 3 : one of main branches 

 from a frond get from Furuta, Prov. Mikawa, \. Fig. 4- : grow- 

 ing apex of frond (dried specimen), ^p. Fig. 5 : cross-section of 

 an older portion of frond showing the cells of central and subcor* 

 tical layers (alcohol), ". F'g- 6 : longitudinal section of the same 

 portion as fig. 5 (alcohol), ^. Fig. 7 : central portion of fig. 5 

 magd. to show the cells of central layer and subcortical sheath 

 and the connecting pits of longitudial cells, a, a, as well as cent- 

 ral cavity c, c, (alcohol), 1 J r> . Fig. 8: cross-sction of a younger 

 branch of another frond, ~. Fig. 9: portion of the same, 4 f. 



PL. CXLV. Fig. 1 : part of a cross-section of the upper por- 

 tion of frond, same as that figured in PL. CXLIII, fig. 5, showing 

 minute cavity, /, (alcohol), -j . Fig. 2 : cross-section of central 

 and subcortical layers of older portion of frond showing very 

 small cavities, appearing as if almost solid, (alcohol), y. Fig. 3 : 

 longitudinal section of upper portion of frond, (alcohol), ^~. Fig. 

 4 : longitudinal section of the frond shown in fig. 7, (dried), 2-p. 

 Fig. 5 : portions of longitudinal cells of the frond shown in fig. 

 3 showing pits, ^. Fig 6 : sporangia ^. Fig. 7 : cross-section 

 of frond showing a large hollow cavity, (dried), "f. Fig. 8 : por- 

 tion of the same as fig. 7, ^. Fig. 9: the same as fig. 8, 



