KNOWLTON.] PLANTS OF THE PAYETTE FORMATION. 729 



The nervation is marked at once by the great number of close camp- 

 todrome secondaries that arise at various angles from perhaps 20 to 

 45. The finer nervation is obscure. 



Among living species this appears to approach most closely to 

 Q. imbricaria MX., which has the same shape, the inequilateral base, 

 and the undulate margin. The differences in the primary nervation 

 are, however, marked. In Q. imbricaria the secondaries are not 

 nearly so numerous ; they emerge at a more acute angle and are more 

 irregular in their course. They are camptrodrome, somewhat as in 

 Q. simulata. 



Among fossil species the one under discussion approaches Q. sim- 

 plex Newby., from Bridge Creek, Oregon, 1 which differs in being nar- 

 rower, with more acuminate apex, and in having fewer secondaries. 

 Ours is also somewhat like Q. convexa Lx. , of the auriferous gravels 

 of California, which differs, however, in being rather oblanceolate 

 with more obtuse apex. The nervation is of the same character in 

 both, and they are evidently related. 



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

 Idaho. 



QUERCUS CONSIMLLIS Newby. 



PI. Oil, fig. 6. 



Quercus consimilis Newby., Proc. TJ. S. Nat. Mus., Vol. V, p. 505, 1883; plates 



ined., PI. LXIII, figs. 2-5. 

 Quercus breweri Lx., Cret. and Tert. Fl., p. 246, PI. LIV, figs. 5-8, 1883. 



This species is represented by the very perfect figured specimen 

 and also a number of equally well preserved but broken specimens. 

 There can be no doubt as to its belonging to Newberry's species, 

 which is from Bridge Creek, Oregon. 



Localities: Two miles southeast of Marsh post-office; 1 mile south- 

 east of Marsh post-office, Boise County, Idaho. 



QUERCUS IDAHOENSIS n. sp. 

 PL Oil, fig. 4. 



Leaves coriaceous, broadly oblong in general outline, rather abruptly 

 rounded at base, obtusely acuminate at apex, margin sharply serrate 

 to just below the apex; the teeth large, almost bristle-pointed, directed 

 upward, sinuses deep, rounded; midrib rather thin, straight; second- 

 aries about 10 or 12 pairs, straight, parallel, craspedodrome, entering 

 the larger teeth, arising at an angle of about 45, subopposite; finer 

 nervation not preserved. 



This species is represented by the single example figured. It is 8 cm 

 long and 3 cm wide. It lacks only a very small portion of the base. It 



Proc. U. S. Nat. Mus., Vol. V, p. 505, 1883; Plates ined., PI. XLIII, flg. 6. 



