xxxix] 



PTILOPHYLLTJM 



523 



Aadrae's Pterophyllum rigidum?- (fig. 596) from Steierdorf is 

 almost certainly a form of Ptilophyllum pecten. The specimen 

 shown in fig. 587 is one of the few examples of fronds apparently 

 preserved in their original position attached in a cluster to a 

 Williamsonia (BucUandia) type of stem. The range in size and 

 form of the pinnae is illustrated in figs. 588, 592, 593. 



FlQ. 596. Ptilophyllum pecten. 

 Andrae's Pterophyllum rigidum 

 from Steierdorf, Banat. (British 

 Museum, No. 41438; nat. size.) 



Fig. 595. Ptilophyllum pecten. The 

 specimen figured by Sternberg as 

 Polypodiolites pectiniformis. (Oxford 

 Museum; f nat. size.) 



Fronds linear, tapering gradually towards the base and apex, 

 often characterised by a marked uniformity in breadth. The 

 pinnae, short or comparatively broad or long and narrow, are 

 straight or more or less falcate; the apex is obtuse or acute or 

 the upper margin of the lamina may be almost straight and the 



1 Andrae (53) A. PI. xi. fig. 1. 



