728 IDAHO MINING DISTRICTS. 



This appears to represent the pistillate ament of a Betula, agreeing, 

 for example, quite closely with the living B. alba, B. papyracea, etc. 

 This view is further strengthened by the finding of leaves of Betula 

 in the same beds. 



I have not thought best to name it specifically, as it is somewhat 

 obscure and better material is necessary for the determination of the 

 minute characters. 



Locality: Two miles southeast of Marsh post-office, Boise County, 

 Idaho. 



BETULA ^QTJALIS? Lx. 



PL Oil, fig. 5. 



Betula cequalis Lx., Mem. Mus. Comp. Zool., Vol. VI, No. 1, p. 2, PI. I, figs. 

 2-4, 1880. 



I am somewhat in doubt as to the correctness of this reference. 

 There is but a single specimen in the collection, and this, as may be 

 seen from the figure, is not perfect, lacking the apex and most of one 

 side and the base. It, however, agrees quite closely with Lesquereux's 

 figures, being only a little more obtuse. The base appears similar as 

 far as can be made out. 



Locality: Two miles southeast of Marsh post-office, Boise County, 

 Idaho. 



QUERCUS SIMULATA n. 8p. 

 PL CI, figs. 3, 4; Oil, figs. 1, 2. 



Leaves coriaceous, lanceolate-acuminate, slightly unequal sided at 

 base, obtuse or obtusely acuminate at apex; margin undulate or 

 remotely shallow-toothed; petiolate, petiole short, thick; midrib 

 strong, straight; secondaries numerous, 12 to 16 pairs, alternate or 

 subopposite, at an angle of 20 to 45, irregular, camptodrome, each 

 joined by a simple bow to the one next above; intermediate second- 

 aries occasional, soon vanishing; ultimate nervation obscure, but 

 apparently quadrangular. 



These leaves appear to have been quite abundant in the beds, for 

 four or five very perfect examples, and numerous more or less frag- 

 mentary ones, occur in the collection. They were evidently thick, 

 coriaceous leaves, suggestive at least of having been evergreen. They 

 range considerably in size, the smallest being 3 cm in length and l cm in 

 width, and the largest 9 cm in length and 2.25 cm in width. The average 

 size, represented by figs. 1 and 4, is about 8 cm in length by 2 cm in 

 width. In the smaller specimens the petiole is scarcely 2 m long, 

 while in the larger ones it is nearly or quite l cm in length. They are 

 slightly unequal-sided at base, and obtuse (fig. 1) or somewhat acumi- 

 nate (fig. 4) at apex. The margin is undulate, or very slightly and 

 remotely toothed. 



