AKT.23 THE ESMERALDA FORMATION — ^BERRY 9 



and Mascall formations is in itself sufficient evidence of the vague- 

 ness of such long-range identifications. There can not be the slight- 

 est doubt but that this Esmeralda willow is a different species from 

 Braun's European form. 



In a recent study of the flora of the Latah formation of eastern 

 Washington I have referred exactly similar small Salix leaves to the 

 normally larger Salix inquirenda, and since the Esmeralda and 

 Latah formations are not especially remote geographically and are 

 of approximately the same age, I have made a similar disposition of 

 this Esmeralda form. 



SAUX KNOWLTONI, new species 



Plate 2, fig. 1 



Uyrica lanceolata Knowlton, U. S. Geol. Surv. 18th Ann. Kept., pt. 3, 

 p. 724, pi. 99, figs. 5, 6, 1898. 



This species was described from the Payette formation of Idaho 

 as a Myrica, which it is not. It is represented in the Esmeralda 

 formation by numerous fragments, which show it to have been a 

 linear-lanceolate, entire margined Salix. 



Occurrence. — Coal prospect 4 miles southeast of Morgan Ranch 

 and 15 miles west of Hawthorne, Mineral County, Nev. 



Holotype.—C2it. No. 37302, U.S.N.M. 



Genus POPULUS Linnaeus 



POPULUS LACUSTRIS (Knowlton) Berry 



Ficus lacustris) Knowlton, U. S. Geol. Surv. 21st Ann. Rept, pt 2, p. 215, 

 pi. 30, fig. 26, 1901. 



The single incomplete specimen which is the type and only known 

 specimen of this species has no features warranting it reference to 

 the genus Ficus. On the other hand, so far as they are shown the 

 form, margin, and venation are characteristic of the genus Populus^ 

 to which I have accordingly transferred it. 



Order FAGALES 



Family FAGACEAE 



Genus QUERCUS Linnaeus 



QXJERCtrS SIMULATA TRUNCATA, new rariety 



Plate 2, fig. 3 



Leaves of various sizes, represented in the Esmeralda formation 

 by several fragments and by the single complete leaf figured. This 

 differs from the type, which came from the Payette formation near 



