52 FOSSIL FLORA OF THE JOHN DAY BASIN, OREGON. [bull. 204. 



a nuinbor of forms, but after careful comparison I am forced to 

 regard it as hitherto undescribed. It is clearly an oak leaf of the well 

 known sent per tu'rens type, and is allied to a number of fossil forms of 

 this kind. It differs, for instance, from Quercus slinplex Newb./' in 

 being much shorter, relatively broader, with shorter petiole and closer, 

 lower angled secondaries. It somewhat resembles Q. con/vexa Lesq.,* 

 of the Auriferous gravels of California, but differs in nervation, 

 petiole, and other details. It is not greatly unlike the smallest leaves 

 of Q. mnulata Knowlton,' from the Payette formation of Idaho, but 

 is sharper at both ends and has an undulate margin and a much 

 shorter, thicker petiole. 



Locality. — White hill one-half mile east of original Van Horn's 

 ranch locality. Collected by Knowlton and Merriam, July, 1901 

 (U. S. Nat. Mus., No. 8546). ^ 



QuEKCUs HOKNiANA Lesq. 

 PL VIII, fig. I. 



QuEKCus HOKNIANA Lesq., Proc. U. S. Nat. Mus., Vol. XI, p. 17, 1888 (the figure 

 given on PI. V, fig. 6, is not a figure of tliis specimen, being a figure of a speci- 

 men of Ulmus calif ornica) . 



■ Castanea atavia Unger. Lesquereux, Cret. and Tert. Fl., j). 247, PI. LII, fig. 2, 1884. 



The type specimen of Lesquereux's Quercus Juirniana has not pre- 

 viously been figured, the figure supposed to represent it being that of 

 a specimen of fJlmus californica from the same beds. It is here 

 figured for the first time, and it needs but a glance to show that it is 

 identical with the leaf identified by Lesquereux as Castanea atavia 

 Unger, a fact apparently overlooked by Lesquereux when he estab- 

 lished Q. Iiornianu. I have not been able to see any European 

 material of Castanea atavia., but a study of the type figures,'^ as well 

 as others, leads me to the conclusion that Lesquereux was in error in 

 identifying the John Day leaf with this species. In the European 

 species the teeth are smaller and lower, the secondaries opposite and 

 only about ten pairs instead of fifteen or more pairs, and the finer 

 nervation is nuich more open. In the John Day form the margin is 

 entire for a considerable distance above the base while the upper por- 

 tion is provided with very large, sharp teeth. 



While there can be no doubt that this leaf is the same as that fig- 

 ured by Lesquereux as Castanea atavia, there may be some as to its 

 being referred to Quercus. The size and shape of the leaf, however, 

 are very suggestive of an oak, and for the present it may remain in 

 this genus. It is very well marked and one not likely to be easily 

 mistaken for anything thus far discovered in these beds. 



"Later Extinct Floras, p. 78, PI. XLIII, fig. 6. 



6F0SS. PI. Aurif. Gravel, p. 4, PI. I, figs. 13-17, 1878. 



c Eighteenth Ann. Kept. U. S. Geol. Surv., Pt. Ill, p. 728, PI. CI, tig. 3. 



dFoss. Fl. V. Sotzka, p. 34 (164), PI. X (XXXI), tigs. 5-7, 1850. 



