XXXVII] 



WILLIAMSONIELLA 



469 



reproduced in fig. 572 ; it has the form of a royal crown 1 2 mm. 

 high with 12 -16 vertical ridges separating flat surfaces formed 

 by the pressure of microsporophyll apices in the unexpanded 





B 



FIG. 571. Williamsoniella coronata. A, flower showing two microsporophylls 

 and the central axis with megasporophylls. B, apical view of an unexpanded 

 flower. C, flower-axis showing the shallow grooves made by the infolded 

 microsporophylls, which have fallen, and a few megasporophylls, s. (After 

 Thomas; A,xl$; B, C,x3.) 



