USNM 37595 Pseudoprotophyllum dentatum Hollick  

Notes

Hollick (1930)

Pl. 65 Fig. 2

 

Locality

From Hollick (1930) (p. 93)

"Yukon River, north bank, about 17 miles below Nulato (original No. 33); collected by W. W. Atwood and H. M. Eakin in 1907 (lot 4639) (pl. 65, fig. 1; pl. 73, fig. 3). Yukon River, north bank, just above Williams mine (original No. 3AH30); collected by Arthur Holiick and Sidney Paige in 1903 (lot 3269) (pl. 65, fig. 2). Yukon River, south bank, about 25 miles below Mission Creek; collected by J. E. Spurr in 1896 (lot 1555) (pl. 66, figs. 2, 3). Yukon River, north bank, 1 1/2 miles above Williams mine (original No. 36); collected by W . W. Atwood and H.M. Eakin in 1907 (lot 4642) (pl. 67)."

 

Locality Map

 

Description

From Hollick (1930) (p. 93)

"Plate 65, Figures 1, 2; Plate 66, Figures 2, 3; Plate 67; Plate 73, Figure 3"

"Leaves orbiculate, peltate, 11 centimeters in length by 13 centimeters in width, sharply and irregularly dentate; nervation craspedodrome, pinnate subpalmate, consisting of a slightly curved midrib with four or five pairs of subopposite, ascending, secondary nerves, the lowest pair simulating lateral primaries, each with six or seven branches on the under side, the lower branches forked three times, the intermediate ones twice or once, the upper ones simple, each main and subsidiary branch terminating in a marginal dentition; basilar veinlets mostly forked, radiating laterally and downward and terminating in the adjacent teeth."

 

Remarks

From Hollick (1930) (p. 93)

"These leaves appear to be slightly oblique at the base; but the apparent obliquity may represent merely imperfections in the margins.

Two leaves that are more or less suggestive of this species may be found figured by Lesquereux (1892) (pl. 63, figs. 1, 2) but without any name or description in the text. They are designated "Protophyllum denticulatum sp. nov." in the accompanying explanation of the plate; but by referring to the description and figure of that species (Lesquereux 1892) (p. 193, pl. 36, fig. 9) it will at once be apparent that there is no possible specific relationship between Figures 1 and 2 on Plate 63 and P. denticulatum, and the inference seems to be unavoidable that the explanatory designation is erroneous and that it was probably included inadvertently. (See Note)

It is with some hesitation that the imperfect specimen represented by Figure 3, Plate 73, is included in the species. The entire margin is lacking, and the base is only partly preserved; but the nervation is well defined throughout, and this agrees in its characters with those of P. dentatum. Also, the specimen was found at the same locality with the type of the species (pl. 65, fig. 1), and both are included in the same collection."

Note: Hollick makes the following comment:

"In order that the two figures above cited may have a specific title by which they may be recognized and referred to, the following name is proposed for the species and a brief description appended:

Protophyllum lesquereuxii Hollick, n. name (= Lesquereux, Leo, The flora of the Dakota group: U. S. Geol. Survey Mon. 17, pl. 63, figs. 1-2. no name or description in text, 1892).

Leaves roughly oblate or triangular-ovate, asymmetric, peltate at a distance of 1 centimeter from the base; margin unevenly and sharply triangular-dentate and denticulate; base obliquely truncate; midrib turned to one side at the apex; nervation pinnate, craspedodrome; secondary nerves mostly opposite or subopposite, leaving the midrib at various angles of divergence, the upper ones at acute and the lower ones at obtuse angles, all except the upper ones branched on the under side; basilar veinlets forked or simple, radiating laterally and downward from the midrib."