XXXVIlJ 



WILLIAMSONIA 



425 



is believed bore flowers of the Williamsonia type. For the 

 imperfectly preserved piece of stem shown in fig. 541 the name 

 Williamsonia (Bucklandia) gigas is employed, as there is no 

 reasonable doubt that in addition to the fronds of Zamites gigas 

 it bore peduncles (fig. 541, a), with Williamsonia flowers. This 



FIG. 542. Williamsonia gigas. Flowering shoot and flower-bud. 

 (Yates Collection, Paris.) 



and other stems found in close association with Williamsonia 

 flowers in England, India, and Mexico are of the type known as 

 Bucklandia 1 ', but it would in most instances be unwise to add 

 Williamsonia even as a subordinate title. Casts of stems in 

 close association with fronds and flowers are not uncommon in 



1 See page 480. 



