522 



PTERIBOS PERMS, ETC. 



[CH. 



Blanckenhorn^ from the Bunter beds of Commem. The pinnate 

 leaves reach a length of 65 cm. ; the lower semicircular pinnules 

 pass gradually into broadly linear segments characterised by an 

 auriculate base and a Neuropteris type of venation (fig. 354, 

 D', E). In the example reproduced in fig. 349 firom one of 



Fig. 349. 



Neuropteridium 

 J iiat. size.) 



intermedium (Sohimp.). (After Blanckenhorn. 



Blanckenhorn's figures, the fronds are attached to a short and 

 thick rhizome bearing roots and portions of old petioles. 



An example of another Triassic species is afforded by Neuro- 

 pteridium grandifolium Schimp. and Moug., which agrees very 

 closely with N. validiim in the size and shape of the pinnules. 

 ' Blanckenhorn (85) p. 127, Pis. xvii. — xix. 



