XXXVIl] 



WIELANDIBLLA 



463 



WilUamsonia recentior Dawson. 



The specimens from the Middle Cretaceous of Canada figured 

 by Dawson^ under this name are very imperfect and of no botanical 

 value. 



WIELANDIELLA. Nathorst. 



The specimens on which this genus is founded were originally 

 described by Nathorst from Hor in Scania as WilUamsonia angusti- 

 folia^ : in a second paper^ a restoration of the plant was pubHshed 



Fig. 566. Wielandiella angvMifolia. (After Nathorst.) 



(fig. 566). The examination of additional specimens from the 

 Rhaetic of Bjuf and of cuticular preparations led to the establish- 

 ment of a new genus Wielandia^ for which Wielandiella^ was 

 afterwards substituted, Wielandia having been previously employed 

 for an existing plant. Wielandiella agrees in the general morpho- 

 logy of its bisporangiate flowers with Cycadeoidea, but differs 

 widely from nearly all other members of the Bennettitales in the 

 repeatedly forked slender stem which is in marked contrast to the 

 vegetative axis of any recent Cycad. Among recent Cycads with 



' Dawson (85) p. 12, PI. iv. fig. 1. 



2 Nathorst (80) p. 50. 



« Ibid. (09) p. 22, Pis. v., VI. 



» Ibid. (88); (02) p. 9, Pis. i.— in. 

 6 Ibid. p. 33. 



