12 



GINKGOALES 



[CH. 



The name Ginkgoites as used in this chapter is restricted to 

 leaves that are regarded as records of the Ginkgoales, while the 

 genera referred by Dr Arber to the Palaeophyllales are briefly 

 described as fossils that may or may not be closely related to one 

 another but which cannot as yet be assigned to any place in a 

 natural system of classification. 



The leaves discovered by Grand'Eury in Permian UraUan beds 

 and described by Saporta as Salisburia primigenia^ should pro- 

 bably be referred to the genus Psygmophyllum: like many other 

 supposed Palaeozoic species assigned to the Ginkgoales or to 

 Ginkgo they afford no satisfactory evidence of affinity to the 

 surviving genus. Other examples of leaves from Palaeozoic rocks 

 described as species of Ginkgo or Salisburia on inadequate grounds 

 are described in the latter part of this chapter. The Rhaetic 

 leaves described by Brauns as Cyclopteris crenata and afterwards 

 referred by Nathorst, with some doubt, to Ginkgo are described 

 in the account of Psygmophyllum^. 



Ginkgoites obovata Nathorst. 



Fig. 632 A shows the form of the specimen from the Rhaetic 

 beds of Scania on which Nathorst^ founded the species Ginkgo 



Fig. 632. A. Giyikgoiles obovata. B. Ginkgoites antarctica. (Nat. size • A after 

 Nathorst; B. drawn from a specimen in the University Museum, Brisbane.) 



Saporta and Marion (8.5), p. 14.5, fig, 74. 

 Nathorst (86) p. 93, PI. xx. fig. 5. 



See page 88. 



