XLIl] 



PSYGMOPHYLLUM 



87 



divided by a deep median sinus into two bilobed segments and 

 agrees closely with some species of Baiera. By some authors this 

 species would be included in Ginkgophyllum but, as already stated 

 in the account of the genus, the degree of dissection of the leaves 

 is too variable and unimportant a character to be made the basis 

 of a generic differentiation. 



Psygmophyllum Grasserti (Saporta). 



This Permian species from Lodeve 1 , France, agrees closely with 

 P. flabellatum in the size and outline of the leaves^as also in their 



FIG. 669. Psygmophyllum Grasserti. (After Saporta; % nat. size.) 



method of attachment to the axis, but it is distinguished by the 

 division of the lamina into linear segments (fig. 669). A species 

 with similar leaves, from the Permian beds of the Ural mountains, 

 is figured by Saporta as Ginkgophyllum kamenskianum 2 . Johnston 3 

 describes a species, Ginkgophyllum australe, from * Mesozoic ' rocks 



1 Saporta (75) p. 1018; (84) PI. 152, fig. 2. 



2 Saporta and Marion (85) p. 144, fig. 73, B; Saporta (82). 



3 Johnston (86) p. 178. 



