50 FOSSIL FLORA OF THP: JOHN DAY HASIN, <)HK(}ON. [nuu,. '204. 



to he wondered that Le.squereux, with only a single example before 

 him, should regard it as an extremely narrow form of that speeies. 

 But with the tine series now at hand it is clear that it is very distinct. 



Among living species this form is certainly suggestive of Qnn'cus 

 heterophyUa Michx. f., the so-called Bartram oak, which is supposed 

 to be a hybrid between Q. pliellos and Q. ruhra. This resemblance 

 may be only superficial, but it is nevertheless plain. 



I take pleasure in naming this species in honor of Dr. .John C. 

 Merriam, of the Univeritj^ of California. 



Locality. — Van Horn's ranch and the two other near-by localities, 12 

 miles west of Mount Vernon, Grant (bounty, Oregon. Type of fig. 4 

 collected by Major Bendire (U. S. Nat. Mus., No. 8505). Types of 

 other figures collected by Knowlton and Merriam, July, 1901 (U. S. 

 Nat. Mus., Nos. 8506, 8507). Type of fig. 7 collected by Merriam's 

 expedition of 1900 (Mus. Univ. Cal., No. 816). 



QUERCUS DURIUSCULA n. sp. 

 PI. VIII, fig. 2. 



Leaf coriaceous in texture, bi"oadly obovate in general outline, 

 deepW lyrate-pinnatifid into about five lobes, of which the basal are 

 very small, triangular, and obtuse, the other broad, rounded, with 

 deeply undulate or toothed lobes; midrib strong; secondaries three 

 pairs, alternate, ending in the principal lobes, the upper ones with 

 strong branches passing to the smaller lobes; finer nervation not well 

 retained. 



Unfortunately only one example of this form was found, and even 

 this lacks a small portion of the base and has the upper lobes some- 

 what injured, evidently before fossilization. The length was about 

 5.5 cm. and the greatest width about 5 cm. The two basal lobes are 

 less than 1 cm. in length. The outline and such details of nervation 

 as are preserved are well shown in the figure. 



This leaf clearly belongs to the white-oak group, and apparently 

 finds its greatest affinity with Querents minor (Marsh.) Sargent, the 

 well-known post, or iron, oak, a species now common over much of 

 the region east of the Rocky Mountains south of Massachusetts. It 

 is so close to this species, in fact, that it can hardly be distinguished 

 from many of the smaller leaves. It would therefore seem beyond 

 question that the living Q. minoi' is a direct descendant of this fossil 

 form, if, indeed, it has not remained practically unchanged from the 

 time the Mascall beds were laid down to the present day. 



Locality. — White hill one-half mile east of original Van Horn's 

 ran(!h locality, 12 miles west of Mount Vernon, Grant County, Oregon. 

 Collected l)y Knowlton and Merriam, July, 1901 (U. S. Nat. Mus., 

 No. 8508). 



