XXXVIl] 



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 



Fig. 571. WilUamsonidla cmonata. 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, a. (After 

 Thomas; A,xlJ; B, C,x3.) 



