IX. A PRELIMINARY LIST OF THE FOSSIL PLANTS 

 OCCURRING IN THE ROOF OF THE PITTSBURGH 



COAL. 



By Norman McDowell Grier. 



In 1907 during the course of the construction of an electric railway 

 between Wilkinsburg and Ardmore, Pennsylvania, a cut through a 

 small hill about three-quarters of a mile southeast of Wilkinsburg 

 exposed the roof of the Pittsburgh Coal. At that time Dr. Percy E. 

 Raymond, then of the Carnegie Museum, made a collection of the 

 fossil plants thus exposed to view, later placing them in the care of 

 Dr. 0. E. Jennings, of the Section of Botany of the Carnegie Museum 

 (Ace. No. 4526). The writer has since been entrusted with their 

 identification. 



In the determination of these fossils the main reliance has been 

 placed in the various figures and descriptions available, particularly 

 the Atlas and Text of Lesquereux, "Coal Flora of Pennsylvania and 

 of the Carboniferous Formation throughout the United States." 

 Second Geological Survey of Pennsylvania, "P," 1879 and 1880; and 

 also David White, "The Fossil Flora of the Lower Coal Measures of 

 Missouri," United States Geological Survey, Monograph 37, 1899. 

 The following is a list of the fossils so determined, the Department 

 Numbers being given for the various specimens: 



THALLOPHYTA. 



FUNGI. 



Genus Hysterites Unger, 1841. X loia, 5, c. 



I. Hysterites cordaitis Grand Eury. 



This fungus was observed to be extremely common upon various 

 species of Neuropteris, as well as upon all species of Cordaites found. 

 Apparently identical forms were found upon the different hosts. 



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