518 PTERIDOSPERMS, ETC. [CH. 



Grand'Eury L. simplicinervis^, a type in which the veins are 

 frequently unbranched and not repeatedly forked as in most 

 examples of the genus (fig. 329, C). The features of the genus 

 are, the oval-linear or lanceolate shape of the presumably simple 

 frond, its entire or, in one species at least (L. Delafondi, Zeill.), 

 finely dentate margin, the stout rachis giving off at a very 

 acute angle numerous dichotomously branched secondary veins. 



Fig. 347. Leslya simplicinervis, Grand'Eury. (Reduced : after Grand'Eury.) 



In L. Delafondi (fig. 329, C), described by Zeiller^ fi-om the 

 Lower Permian of Autun, the frond may reach a length of 

 more than 20 cm. and a breadth of 8 cm. Similar species are 

 represented by L. ensis^ from the coal-field of Commentry, 

 and L. grandis^ from Upper Carboniferous rocks of North 

 America. The genus is characteristic of Upper Carboniferous 

 and Lower Permian strata: the form of the leaf and the direction 



1 Grand'Eury (90) A. PI. viii. fig. 5. " Zeiller (90) p. 166, PI. xiii. fig. 2. 

 ' Renault and Zeiller (88) A. PI. xxiii. fig. 6. •" Lesquereux, loc. cit. 



