72 THE LATER EXTINCT FLORAS OF NORTH AMERICA. 



branches connecting the lateral nerves either directly or anastomosing, with 

 fine quadrangular network filling the intervals. Fruit ovoid; when mature 

 2 centimeters in length by 15 millimeters in breadth; cupule scaly, covering 

 nearly half of the glans." 



Collected by Rev. Thomas Condon. 



Of the leaves of this species the collection contains many hundreds 

 which show a considerable diversity of size and form; some are only 2 

 inches in length, others 6 ; some have the margin acutely toothed through- 

 out, in others the margin of the lower part of the leaf is entire, the upper 

 denticulate; while in others still the margins are entire or gently undulate 

 to near the summit where they are always more or less denticulate. These 

 leaves closely resemble those that have been described under the name of 

 Q. Brymeja Ung. (Chlor. Prot, p. 113, PI. XXXII, figs. 1-4; Foss. Fl. 

 Sotzka, p. 163 [33], PI. XXIX [VIII], figs. 1, 2; Heer, Fl. Tert. Helv., 

 Vol. II, p. 50, PI. LXXV, figs. 18-20), and also some of them, those in 

 which the margins are closely and sharply denticulate, are not unlike Q. 

 lonchitis Ung. (Foss. Fl. Sotzka, p. 33, PI. IX [XXX], figs. 3-8), but the 

 prevailing character is such as apparently distinguishes them from either 

 of these species or any other described, namely, first, the base broader than 

 in Q. Brymeja, frequently entire for one-third or one-half of the length of 

 the leaf; second, the margins generally denticulate, but sometimes merely 

 undulate or entire except near the summit — a range of variation which 

 does not seem to prevail in the species named. 



In the figures given on PL XLIII, fig. 2 represents the more common 

 or average form and size, figs. 3, 4, and 5 the more denticulate variety. In 

 order to make the series complete it would have been necessary to occupy 

 the entire plate with representations of the different forms observable in 

 the collection. In many of the specimens the preservation is complete, the 

 outlines being sharply defined, the minutest subdivisions of the nerves 

 being retained. The number of acorns and cupules contained in the col- 

 lection is also large, and while it is possible that not all belong to this 

 species, as it is by far the most abundant we are compelled to connect the 

 abundant acorns with the numerous leaves. In fig. 7 an immature acorn 

 is shown still attached to the stem; in fig. 8, a detached cupule; in fig. 9, 

 the base of a large acorn; in fig. 10, a large cupule seen from above. 



Formation and locality: Tertiary (Miocene). Bridge Creek, Oregon. 



