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Fig. 6 : cross-section of tetrasporic ramulus, showing sori, ^p. — 

 Fig. 7 : portion of the wall of frond and dissepiment, ― 

 Fig. 8 : tetrasporanp-ia, Fig. g : ponion of the cross- 



section of frond, ^―. ― Fig. io : paniculate brancmng of peaicel- 

 cell, 



ザ. 



