Locality
From Hollick (1930) (p. 101)
"Yukon River, north bank. about 13 miles below Melozi telegraph station (original No. 3AH12); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3249)"
Description
From Hollick (1930) (p. 101)
"Leaf oblong-elliptical, about 18 centimeters in length by 7 centimeters in width across the middle; margin wavy, irregularly and minutely denticulate; nervation pinnate, campto-craspedodrome; secondary nerves irregularly arranged and spaced, simple or
rarely abnormally flexed or branched, subtending somewhat more acute angles with the midrib on one side than on the other, the upper ones leaving the midrib at angles of approximately 45°, the lower ones at more obtuse angles, mostly camptodrome near the margin, with fine nervilles extending from the marginal loops to the denticulutions,"
Remarks
From Hollick (1930) (p. 101)
"This species is more or less suggestive of the type of leaf represented by Juglans denticulata Heer (1869; 1883) (p. 483, pl. 56, figs. 6 - 9a; p. 10, pl 75, figs. 2 - 10; pl. 85, figs. 1, 2 [Not Juglans denticulata O. Weber, 1852]) from the Tertiary of Greenland, from which it differs, however, in its greater width at base and summit and the more obtuse angles subtended by the secondary nerves with the midrib. Both the base and the summit of our leaf are missing, and hence the terminal outline at each end can only be inferred from the trend of the margin and the relative obliquity of the secondary nerves at the broken ends. Apparently it was less elongated basally and apically than Juglans denticulata Heer and was more like the leaf from the same locality and horizon referred by Heer (1883) (p. 100, pl. 69, fig. 8) to Juglans bilinica Unger.
On the strength of its resemblance to the species mentioned I was at first inclined to refer our specimen to the genus Juglans; but I am now convinced that such reference would be erroneous, and I think that Heer's generic identifications of the several species included in this general type of minute or obscurely denticulate leaves might well be made the subject of critical study and careful comparison."