USNM 37647 Cissites pseudoplatanus Hollick  


Hollick (1930)

Pl. 80 Fig. 2




From Hollick (1930) (p. 105)

"Yukon River, north bank, just above Williams mine (original No. 3AH30); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3269)."


Locality Map



From Hollick (1930) (p. 105)

"Plate 80, Figure 2"

"Leaf about 8 centimeters in length by 8 centimeters in width, orbicular, with an acuminate apex and an acute wedge-shaped base; margin coarsely undulate-dentate in the upper part; teeth broadly triangular, obtuse; nervation tripalmate, craspedodrome; midrib straight; secondary nerves opposite, three on each side slightly curved upward, subparallel, the lowest pair leaving the midrib at angles of about 45°, the upper pairs subtending more obtuse angles; lateral primaries leaving the base of the midrib at acute angles of divergence, almost straight or slightly flexed, subparallel with the secondaries, branched on the under sides."



From Hollick (1930) (p. 105)

"This leaf is of the same general type as Cissites affinis (Lesquereux) Lesquereux (1892) (p. 161, pl. 21, fig. 5) from the Dakota sandstone of Kansas. It differs in the more rigid and regular secondary nervation and in the coarser dentition. The specific designation is suggested by reason of its platanoid aspect."