rnmnlus viewed from above, S 1 t . Fig. 4: outline of the longitudinal 

 section of a rainulus, showing the central axis and hair-leaves, Y- 

 Fig. 5 : the apical cell and the central axis, 3 y. Fig. 6 : lower part 

 of the central axis, 2 j. Fig. 7: longitudinal section of a ramulus 

 bearing tetrasporangia, 3 *. Fig. 8 : tetrasporangium ; a, infracortical 

 cell carrying the tetrasporangium; d, cover-cell; 2 '^. Fig. 9 ; sur- 

 face-view of cover-cells, d, 2 J. Fig. 10 : portion of a branch bear- 

 ing cystocarps, \. Fig. 11 : vertical longitudinal section of a cystocarp, 

 5 j*. Fig. 12 : lower portion of the pericarp, " Q . Fig. 13 : young 

 spores, S j. 



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