XXXIX] PTILOPHYLLUM 523 



Andrae's Pterophyllum rigidum 1 (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 (Bucklandia) type of stem. The range in size and 

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



m 



ill 'M 



- 



FIG. 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. 



