- 103 - 



I have not been able to determine the plant in question only by con- 

 sulting thj literature menti >ned above; f >r, it seems to me much to 

 differ in several points with the present species. But I followed Prof. 

 Yendo who identified this plant to the present species after cnrefull 

 studies of several relateJ specimens kept in the herbaria of different 

 countries. 



PL. CLXXIV. Fig. 1 : upper portion of cystocarpic frond of Rluih.lo- 

 nia robusta, J. Ag., }. Fig. 2: lower portion of frond, }. Fig. 3: 

 cross-section of a smaller branch, 1 1 '-'-. Fi.4. 4 : portion of cross-section of 

 branch showing the cortical structure, -.--Fig. f> : portion of inner fila- 

 ments in the cross-section of branch, -^". Fig. 6: inner filaments in a 

 longitudinal section of branch, -^ . Fig. 7: tetrnsporangin, ? '^. Pig. 8: 

 vertical section of cystocarp, magd. Fig. 9 : smaller clusters of spore- 

 filaments ; c, central cell. ^Mp. Fig. 10: spore-filaments, magd. 



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