FOSSIL FLORA. 707 



OjUEECUS Sp. 

 PI. LXXXIX, fig. 7. 



This is a fragment of the base of what appears to have been a large, 

 thick leaf. It has a thick midrib, and alternate, thin, parallel, straight 

 secondaries, which arise at an angle of about 45°. None of the finer 

 nervation is preserved. 



This has some resemblance to the basal portion of what has been 

 described as Q. cidveri (p. 708), but it was several times larger than this 

 and lacks the marginal toothing. They come from the same beds. 



Habitat: Yellowstone River, one-half mile below mouth of Elk Creek, 

 at base of bluff; collected by F. H. Knowlton, August, 1888. 



Queecus olafseni Heer. 



Quercus olafseni Heer: Fl. Foss. Arct., Vol. I, p. 109, PI. XLVI, fig. 10. Lesquereux: 

 Oret. and Tert. FL, p. 224, PI. XL VIII, fig. 4; p. 245, PI. LIV, fig. 3. 



There are a number of examples of this species, some of which are 

 very well preserved. They are, with the exception of some minor details, 

 identical with the figures given by Heer and Lesquereux. Thus only 

 occasionally are they doubly dentate, and the secondaries rarely branch. 

 They are undoubtedly the same as the leaves figured by Lesquereux. 



This species was reported by Lesquereux from the Bad Lands of 

 Dakota (Fort Union group), and from Table Mountain, California 

 (Miocene?). 



Habitat: Yellowstone River, one-half mile below the mouth of Elk 

 Creek, top of bluff; collected by F. H. Knowlton, August 27, 1888. 



Quercus yanceyi n. sp. 

 PI. LXXXIX, fig. 2. 



Leaf of firm texture, broadly lanceolate, somewhat wedge-shaped at 

 base and acuminate at apex, with undulate toothed margin; midrib strong, 

 straight; secondaries 9 or 10 pairs, alternate, remote, emerging at a low 

 angle, curving upward, the lower ones arching along the border, upper 

 ones entering the teeth or often arching along and joining the one next 

 above; nervilles few, irregular, broken; finer nervation forming irregular 

 areolae. 



