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cross-section of frond, や. 一 Fig. 3 : portion of the same, more 

 highly magd., 一 Fig. 4 : portion of a vertical section of frond, 

 cutting through the midrib, ユミ 9. — Fig. 5 : portion of frond bearing 

 cystocarps, showing the midrib and veins, f . ― Fig. 6 : cystocarps, 

 5 1 2 . ― Fig. 7 : tetrasporic pinnae, - ― Fig. 8 : cross-section of the 

 same, 2 ^°. 一 i^'ig. g : tetrasporic pinnula detached, 2 ^°. 



