FOSSIL FLORA. (3(35 



Rocks and Black Buttes, Wyoming. The most interesting species is Trapaf 

 microphylla. It is represented by several perfectly characteristic specimens. 

 This species was first described from Point of Rocks, Wyoming, and was 

 found later by Professor Ward in lowest Fort Union beds, near the mouth 

 of the Yellowstone River. The Wolverine Creek specimens approach 

 closest to Professor Ward's specimens. Professor Ward is of the opinion 

 that these lower beds represent the Laramie, since the plants in them differ 

 from those in the undoubted Fort Union beds. 



The three species from the divide between Snake River and the 

 southern part of Yellowstone Lake are of little value in determining the 

 age. Geonomites schimperi has never been found in any other locality, and 

 Diospyros stenosepala is very doubtful indeed. It has not since been col- 

 lected, and the specimen on which Lesquereux based his determination can 

 not now be found. The only remaining species, Anemia subcretacea or 

 Gymnogramma haydenii of Lesquereux, has a wide distribution, having been 

 found in the Laramie, Denver, and Eocene. 



DESCRIPTION OF FOSSIL PLANTS FROM THE TERTIARY OF THE 

 YELLOWSTONE NATIONAL PARK. 



PLANTS, EXCLUSIVE OF FOSSIL WOOD. 



FILICES. 



WOODWARDIA PREAREOLATA 11. sp. 

 PI. LXXIX, fig. 1. 



Frond pinnate; pinnae alternate, lanceolate, with slightly undulate 

 margins, connate at their bases, forming a broad wing on the rachis; nerva- 

 tion strongly reticulated, consisting of one or two rows of long lacunae 

 next to the main rachis and along the secondary rachis, and the remainder 

 forming large polygonal, slightly elongated, meshes. 



Unfortunately the specimen figured represents the only example found. 

 It is far from perfect, being only a segment from the middle of a frond, 

 and consequently no idea can be gained of the outline of the whole frond. 

 The segment of the main rachis is 8 cm. long. The pinnae are regularly 



