FOSSIL FLOKA. 709 



lobes. As already stated, the leaf is obscurely oblong in general outline, 

 being slightly wedge-shaped at base and having the strongest teeth or 

 lateral lobes at about two-thirds of the distance from the base. The apex 

 is not preserved, but judging from the contour it must have been rather 

 obtuse. The teeth of the margin are also rather obtuse. The nervation is 

 strongly craspedodrome, the secondaries or branches all entering the teeth. 

 Only a few nervilles are preserved and those appear broken. None of the 

 ultimate nervation has been preserved. 



This species is quite unlike any American fossil species with which I 

 am familiar. Among living species it approaches quite closely to occasional 

 leaves of Q. prinoides Willd., of the eastern United States. The living 

 leaves incline to be more wedge-shaped at base and to have stronger teeth 

 separated by deeper sinuses. It is hardly probable that the resemblance is 

 close enough to warrant the assumption that Q. prinoides has actually 

 descended from this fossil form. 



I take pleasure in having named this fine species in honor of Prof. 

 George E. Culver, some time professor of g-eology in the University of South 

 Dakota, who assisted me in making the collection of plants in the Yellow- 

 stone National Park. 



Habitat: Bank of Yellowstone River, one-half mile below the mouth 

 of Elk Creek ; top of bluff 300 feet above stream, in white, coarse-grained 

 tuff; collected August 28, 1888, by F. H. Knowlton and G. E. Culver. 



QUERCUS HESPERIA 11. Sp. 



Leaf of firm texture, broadly lanceolate in outline, passing from about 

 the middle down into a long wedge-shaped base, rather abruptly pointed at 

 apex; margin with few (8 to 10) strong, sharp, upward-pointing teeth; 

 midrib strong; secondaries 10 to 12 pairs, alternate, straight or slightly 

 curving, ending directly in the teeth; intermediate secondaries frequent, 

 about midway between the secondaries, disappearing about halfway between 

 midrib and margin; nervilles irregular, producing large, coarse areolation; 

 finer nervation similar. 



The specimen upon which this species is founded is nearly perfect, 

 lacking only the tip. It is 6 cm. long and a little more than 2 cm. wide. 

 The lower half of the leaf is regularly wedge-shaped and the upper portion is 



