4 FOSSIL FLORA OF THE SIERRA NEVADA. 



pean F. sylvutica, Linn., to which it is related in an equal degree, differing 

 by its more acute base, and by more numerous less straight secondary 



veins. 



Habitat. — Chalk Bluffs, California. Voy's Collection. 



QUERCUS, Linn. 



§ I. — Leaves Entire. 



Quercus elsenoides, sp. nov. 

 PI. I. Figs. 9-12. 



Leaves coriaceous, oval or oblong, lanceolate, marly equally narrowed upward to a 

 point, or a, short obtuse acumen, and doionward to a short petiole/ lateral reins 

 at an open angle of divergence ; parallel camptodrome. 



These leaves vary in size from five to ten centimeters long, and from 

 two to three centimeters broad ; either oval-pointed or oblong, lanceolate 

 acuminate, gradually narrowed to the petiole. The midrib is narrow ; 

 the lateral veins open, diverging about 50°, curving, camptodrome, and 

 generally blanching near the borders. The areas are more generally 

 simple, as in Fig. 11, but sometimes divided in the middle by tertiary 

 veins, anastomosing with nervilles at a distance from the middle nerve, 

 and passing by divisions into the areolation ; nervilles distinct in right 

 angle to the secondary veins, forming, by multiplied branches in opposite 

 directions, small quadrate meshes, as seen in Figs. 11 and 12. The species 

 is closely related to Quercus elcena, Ung., especially to the figures in 

 Heer (Flor. Tert. Helv., III., PL CLI. Fig. 3,) and in Saporta (Etud., 

 III., PI. V. Fig. 2). Like the following species, it is of the type of 

 Quercus virens, Ait., and Q. cinerea, Muhx., of the Southern United States 

 flora. 



Habited. — Table Mountain. Voy's Collection. 



Quercus convexa, sp. nov. 

 PI I. Figs. 13-17. 



Leaves of a thick coriaceous consistence, small, oblong, obtuse, rounded, and narrowed 

 to a short petiole; borders reflexed, very entire; surface convex; nervation camp- 

 todromt . 



The collection has a large number of finely preserved specimens of this 

 species, easily identified by their small oblong, obtuse, always convex leaves. 



