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frond cutting perpendicular to the surface, showing the shorter 

 branches from the central axis, や. 一 Fig. 4 : optical tangential 

 section of frond, showing the longer branches from the central 

 axis, ザ. 一 Fig. 5 : surface view of the apical portion of frond, 

 ^―. ― Fig. 6 ： portion of branch bearing receptacles of tetra- 

 sporangia, ザ. 一 Fig. 7 : receptacle of tetrasporangia in surface 

 view, — Kig. 8 : cross-section of the same, ぎ. 一 Fig. g : 

 longitudinal section of the same, moderately magd. ― Fig. 10 : 

 portion of the same as fig. 9, — t ig. 11 ： formation of 

 tetrasporangia, ^f 4 . ― Fig. 12 : anomalous growth of fertile 

 ramuli, |. ― Fig. 13 ： portion of branch bearing cystocarps, 

 slightly magd. ― Fig. 14 ： cystocarps viewed from flat surface, 

 ぎ. 一 Fig. 15, 16 ： longitudinal section of cystocarps cutting per- 

 pendicular to the flat surface, showing two neuclei, や. 一 Fig. 

 17 ： longitudinal section of a cystocarp cutting in the same plane 

 as fig. 15, ― Fig. 18: spore-filaments, や. 



