USNM 37493 Populites mirabilis Hollick  

Notes

Hollick (1930)

Pl. 33

 

 

Locality

From Hollick (1930) (p. 67)

"Yukon River, north bank, about 12 miles below Melozi telegraph station (original No. 3AH11); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3248)."

 

Locality Map

 

Description

From Hollick (1930) (p. 67)

"Plate 33"

"Leaf large, of unknown shape and dimensions, coarsely triangular dentate, the teeth broad and blunt, with shallow sinuses between; nervation pinnate(?), craspedodrome; midrib strong; secondary nerves stout, flexuous, widely spaced, arranged in subopposite pairs, those on one side leaving the midrib somewhat more obliquely than those on the opposite side; tertiary nervation relatively fine, consisting of branches from the under sides of the lower secondaries toward the extremities, and curved or angled nervilles that form a network of polygonal areolae throughout the lamina."

 

Remarks

From Hollick (1930) (p. 67)

"This fragment is referred to the genus Populites because of the character of the dentition in combination with the apparent asymmetry of the leaf. So far as can be seen the secondary nervation is pinnately arranged throughout, but the basal part of the leaf is missing, and it is possible that the lowest pair of secondaries may have a subpalmate arrangement. The midrib is slightly curved to the left in our specimen, and on that side the secondary nerves subtend more obtuse angles with the midrib than those opposed to them. The latter are more extended, so that the extremity of the third one from the apex occupies about the same relative position as that of the second one on the opposite side, and so on. The indications are that one side of the leaf (the right side in our specimen) was more broadly rounded in outline than the other.

Our specimen is ruptured in three places through the middle, and the adjacent parts are laterally displaced. It is evident that if the midrib were restored to its original condition the curvature would be more pronounced and the asymmetry of the leaf more obvious."