DESCRTPTIOIsr OF SPECIES. PP. 63 



Pecopteris arborescens^ Var. integripinna, PL XXVII. 

 Fig. 6. 



This curious looking pkmt has its pinnules somewhat 

 similar in form with P. arborescens, but the general facies 

 is quite different. We at first supposed that it might have 

 derived its peculiar character from some malformation, or 

 some effect produced by compression and distortion, but 

 we find it at three widely distant localities, viz : Tyler, 

 Marshall and Monongalia counties, unfortunately always 

 failing to show the minute details of its nervation, a point 

 which if known would decide its specific character. It is 

 not a fructified pinna of some large Pecopteris, for some 

 of the specimens show that the seeming pinnules are really 

 composed of united pinnules of the type of P. arborescens. 

 As may be seen, the pinnae are very short and broad, simu- 

 lating pinnules in form. They show no tendency to lengthen 

 as we pass to a lower part of the common rachis. The plant 

 in Tyler and Marshall counties occurs from 400 to 600 feet 

 above the Waynesburg Coal, and in Monongalia county it 

 is found on the horizon of this bed. 



Pecopteris Candolleana^ Brongt. Plate XX, Figs. 1, 2, 

 and 3. 



West Union in Doddridge Co. is the only locality at which 

 this plant has been seen. It occurs there in great abund- 

 ance in the roof shales of the Waynesburg Coal. The facies 

 of the plant differs somewhat from Brongniart's species, 

 but closely resembles the plant figured by Germar. With 

 these well known forms we find some which present differ- 

 ences sufficient to call for description. The ultimate pin- 

 nae of what appears to be the lower part of pinnae of a su- 

 perior order, are seen to possess crenulated pinnules, and 

 these more rarely pass into lobed pinnules, while the ner- 

 vation becomes correspondingly more complex. The nor- 

 mal form has in the pinnules lateral nerves, forking once, 

 or at most with one of the veinlets forking again, as Germar 

 well shows. In the crenulated pinnules of our specimens 

 the lateral nerves are twice forked. The lobed pinnules do 

 not show the details of the nervation, owing to poor preser- 

 vation. 



