700 GEOLOGY OF THE YELLOWSTONE NATIONAL PAKE. 



FAGACE.E. 



Fagus antipofii Abich. 



Fagus antipofii Abich. Lesquereux : Ann. Kept. U. S. Geol. and Geog. Surv. Terr., 1S72 

 (1S73), p. 403. 



Identified by Lesquereux, but not since observed. 

 Habitat: "Elk Creek, near Yellowstone River; A. C. Peale, Joseph 

 Savage, and O. C. Sloane." 



Fagus undulata n. sp. 



PL LXXXV, figs, -i, 5. 



Leaves small, of very firm texture; elliptical with a broadly wedge- 

 shaped base and apparently obtuse apex ; margin regularly undulate- 

 toothed, the teeth being regularly rounded and separated by similarly 

 rounded sinuses; midrib strong, straight; secondaries numerous, opposite, 

 parallel, unbranched, all entering the obtuse teeth; nervilles very numerous, 

 at right angles to the secondaries, usually broken and anastomosing, 

 although sometimes irregularly percurrent; finer nervation producing 

 small, irregularly quadrangular areolation. 



This fine species is fortunately represented by several very perfectly 

 preserved examples, the two figured showing both the basal and apical por- 

 tions. They vary in length from 6 to 10 cm. and in width from 2.75 to 4 

 cm. The margins are very regularly undulate-toothed, the sinuses being 

 almost an exact reverse of the nearest teeth. The wedge-shaped base is, 

 however, without teeth for a short distance. The secondaries are at an 

 angle of about 45°. They are parallel, and all enter the obtuse teeth. All 

 of the finer nervation is beautifully preserved and is seen to lie irregularly 

 quadrangular. 



This species does not approach closely to any living species known to 

 me. It is perhaps nearest to certain forms of the common American F. 

 ferruginea Ait., but the living form differs in being proportionately broader, 

 and when toothed has sharp teeth, quite like Castanea, and pointing upward. 



Among the 80 or more fossil species that have been described from 

 various parts of the world, there are several that our species more or less 

 closely resembles. Of these, F. dentata Gropp., as identified by Heer 1 in the 



' Fl. Foss. Arct., Vol. I, p. 106, PI. X, ligs. lb, 9. 



