XXVIl] 



CALLIPTERIS 



559 



This polymorphic species (fig. 367) is one of the most 

 characteristic Permian plants. The oval-linear pinnules, attached 

 by the whole base, occur on both pinnae and rachis; this 

 feature, the thick texture of the lamina, and the linear, obliquely 

 set, pinnae render the fronds easily recognisable. The fronds 

 bore seeds. 



Fig. 367. Callipteris conferta. From the Permian of Aschbach, Bhenish 

 Prussia (British Museum, No. 39052). 



In a recent account of some Permian plants from Germany, 

 Schuster' refers a portion of a frond to Callipteris conferta 

 (Sternberg) var. polymorpha Sterzel, which is characterised by 

 unusually large and polymorphic pinnules. In size and shape 

 the pinnules recall those of Neuropteridium validum Feist. 



1 Schuster (08) PI. viii. fig. 7. 



