DESCRIPTION OF SPECIES— CUPULIFER^. 153 



§ II. — Leaves serrate, dentate, or crenate. 

 Qnercus Valdensis, Heer. 



Plate XIX, Fig. 8. 



Quercus Valdensis, Heer, Fl. Tert. Helv., ii, p. 49, pi. Ixxviii, fig. 15; iii, p. 178, pi. cli, fig. 17. — Ett., 

 Foss. Fl. V. Bil., p. 56, pi. xvi, figs. 5, 6, 7. 

 Leaves coriaceous, ovate, acumiuate, rounded to the petiole ; secoudary veins close, parallel, more 

 open toward the base, subcamptodroine ; borders obscurely dentate. 



This fragment, representing the lower part of a coriaceous leaf, whose 

 base is rounded to a slender, short petiole, has rather the appearance of a 

 leaf of Betula, or of Ostrya, than of a Quercvs. It resembles closely, how- 

 ever, the fragment described by Heer (Joe. cit., tig. 15) by its coriaceous 

 consistence, its form, and nervation. The sharp denticulation of the teeth is 

 not distinct in this specimen. I have seen another, from Contra Costa, 

 California, which is more perfect, representing a whole leaf, acuminate and. 

 sharply dentate, witli the same type of nervation as this one, and evidently 

 referable to the same species. The secondary veins are subcaraptodrome, 

 either following along the borders in festoons and entering the teeth by 

 nerviUes, or some of them passing up to the point of the teeth, as marked 

 by d'Ettingshausen (Joe. cit., fig. 7). ' This species is evidently extremely 

 variable ; for the leaves seen by this last author are obtuse, some of them 

 round-oval ; in all, however, the secondary veins are more open toward the 

 base, and the nervilles distinct, nearly simple, and continuous in right angle to 

 the veins. 



Habitat. — Lignites of Rock Creek, Laramie Plains, Wyoming, with 

 Quercus acrodon, Pojmlus subrotundata, etc. {Dr. F. V. Hnyden). 



Quercus Oodeti!, Heer. 



Plate XX, Fig. 1. 



Quercus Godeli, Heer, Fl. Tert. Helv., ii, p. 50, pi. Ixxviii, figs. 10, H ; iii, p. 179, pi. cli, fig. 11. — Lesqx., 

 Annual Keport, 1871, p. 297. 



Leaf snbcoriaceous, lanceolate, tapering upward, rounded to the base; borders serrato-dentate; 

 secondary nerves numerous, parallel, branching near the borders, camptodrome, separated by tertiary 

 shorter veins. 



Of the two specimens which we have of this species, the best preserved 

 one is figured here. The leaves appear coriaceous, or, at least, subcoriaceous, 

 their surface being blackened by an adhering thin coating of coaly matter 

 and undulately wrinkled across, as in coriaceous leaves; the stone is, however, 

 too coarse to show the thickness of the vegetable remains imbedded into it. 

 These leaves are unequal at the base, more enlarged and rounded on one 



