USNM 37645 Cissites yukonensis Hollick  

Notes

Hollick (1930)

Pl. 79 Fig. 11

 

 

Locality

From Hollick (1930) (p. 106)

"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. 106)

"Plate 79, Figure 11"

"Leaf iregularly lobo-dentate, narrowed above to an obliquely prolonged apex, cordate at the base; nervation palmate from the base, apparently three lateral primaries on one side of the midrib and two on the other, the outer ones spreading, the inner pair ascending and conspicuously forked in their upper parts, each main branch terminating in the apex of a lobe; midrib sharply flexed or angled above and forked, a branch springing from each of the angles and terminating in the apex of a lobe."

 

Remarks

From Hollick (1930) (p. 106)

"This leaf appears to be somewhat asymmetric at the base and with the apex turned to one side. In some respects it is suggestive of certain leaves that have been referred to the genus Menispermites; but it is clearly in the same generic category as Cissites dentatolobatus Lesquereux (1892) (p. 164, pl. 66, fig. 4) from the Dakota sandstone of Kansas, which might be regarded merely as a more deeply lobed form of our species. Some of the points of resemblance between them are striking, and their differences are no greater than are those that may be noted in connection with the many diverse forms that have been included under the one specific name Cissites formosus Heer (1882) (p. 85, pl. 21, figs. 5 - 8) as discussed in connection with Cissites comparabilis, the species last described."