XXVl] SAGENOPTEEIS 483 



Sagenopteris appears to have been widely distributed during 

 the Rhaetic, Jurassic and Lower Cretaceous floras. The very 

 great similarity between the specimens recorded from these three 

 formations renders the genus an uncertain guide in regard to 

 geological age. Decisive evidence as to its position in the 

 plant kingdom is at present lacking : the inclusion of the genus 

 as a possible member of the Hydropterideae has still to be 

 justified. 



