"U. S. Geol. Rep," vii, p. 14.'>. 

 Ihid.. p. 14t>, pi. xix. figs. 1-3. 



Ihid.. p. 147. 



Ibid., p. 156, pi. XX, figs. 9, 10. 



FLORA OF THE GREEN lilVER GEOUP, 153 



FAGUS, Tournf. 



Fagrus FtToniiB, Ung. 



aUERCUS, Linn. 



§ 1. Leaves deutate. 

 Qiieroii.s Haidiugeri, Ett. 



Quercus Medi terrauea, Ung. 



Plate XXVIII, Fig. 9. 



Ung., "Chlor. Protog.," p. 114, pi. xxxii, figs. 5-9; "Iconogr.," pi. xviii, figs. 1-G; Heer, "Fl. Tert. Helv.," ii, 

 p. ^ii, pi. Ixxiii, figs. 13, l.'j. 17. 1-J; Ung.. "Foss. Fl. v. Kumi," p. 28, pi. vi, figs. 1-22; Gaud., 

 "Contr.,'' ii, p. 4ti, pi. iv, figs. 16-19. 



Leaves coriaceous, obovate, abruptly acuminate, narrowed toward the base and 

 abruptly rounded to it, deeply dentate; secondary nerves simple, craspedodrome, about 

 9 pairs; nervilles strong, at right angles to the secondary nerves, simple or more 

 generally anastomosing in the middle. 



Except that the teeth of the borders are sUghtly more acute and 

 turned upward in the European species, I see no difference sufficiently 

 marked to authorize a separation of this leaf into a new species. The leaf, 

 fig. 3 of Ung., loc. cit., is like a counterpart of our fig. 9, and in other 

 leaves figured by different authors the teeth of the borders are not sharply 

 acute, but sometimes obtuse and nearly effaced. It is the case in Ung., 

 "Chlor.," pi. xxxii, fig. 5; in Heer, '-Fl. Tert. Helv.,"" pi. Ixxvi, figs. 13-15. 

 The nervilles are distinctly seen in figs. 3-4 given of this species in Ung., 

 "Fl. V. Kumi," pi. vi, where twenty leaves of this species are represented. 

 All these, however, have the border teeth more acute and proportionally 

 smaller than in fig. 9 of our plate. 



i/r</>._Florissant. U. S. Geol. Expl. Dr. F. V. Ilayden. 



Quercus seri-a, Ung. 

 "Chloris Prolog.," p. 109, pi. xxx, figs. 5-7. 



Leaves petioled, subcoriaceous, elliptical, pointed or obtuse, serrate-dentate on 

 the borders ; teeth equal, with callous points. 



A single leaf,. 4 centimeters long without the petiole, 2i centimeters 

 broad, remarkably similar to fig. 7 of Ung., loc. cit., oval or obtusely ovate, 



