486 



CYCADOPHYTA 



[CH. 



are broad but the cells are not preserved. The pith-cast is of 

 the usual Cycadean type. 



The type-specimen was presented by the Cirencester College 

 to the British Museum. 



Buchlandia huzzardensis (Stopes). 



This species, from Lower Greensand beds at Leighton Buzzard 

 and beheved to be derived from Wealden strata, is described by 

 Dr Stopes^ as Cycadeoidea huzzardensis. Though agreeing generally 





i':ii 





I ll 



FiQ. 578. Buchlandia huzzardensis. Rough sketch of a block of wood showing 

 parts of at least eight concentrically arranged rings of secondary wood. 

 (After Stopes; x f.) 



with B. Yatesii, the stem is specifically separated on the ground 

 that the petiole-bases are more expanded laterally and because 

 of the occurrence of several vascular cylinders (fig. 578), sometimes 

 as many as eight, each with a maximum diameter of 1 cm. 

 Dr Stopes thinks it possible that B. huzzardensis is an older form 

 of B. Yatesii. 



1 Stopes (15) p. 309, text-figs. 98—100. 



