USNM 37606 Pseudoprotophyllum comparabile Hollick  

Notes

Hollick (1930)

Pl. 70 Fig. 2

 

 

Locality

From Hollick (1930) (p. 94)

"Yukon River, southbank, about 3 miles below Seventymile Creek (original No. 3AH4); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3243) (pl. 63, fig. 1). 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. 70, fig. 1). Yukon River, north bank, about 1 mile above Pickart's mine (original No. 3AH18a); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3254) (pl. 70, fig. 2). Yukon River, north bank, in the vicinity of Nulato; collected by W. H. Dall in 1866 (pl. 71, fig. 2). Yukon River, north bank, about 12 miles below Melozi telegraph station (original No. 8AH11); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3248) (pl. 73, fig. 2)."

 

Locality Map

 

Description

From Hollick (1930) (p. 94)

"Plate 63, Figure 1; Plate 70, Figures 1, 2; Plate 71, Figure 2; Plate 73, Figure 2"

"Leaves of medium size, peltate, with undulate, denticulate margins; nervation pinnate subpalmate, consisting of a straight midrib and several pairs of subopposite secondary nerves, the lowest pair flexed or somewhat angled, with irregularly disposed branches on the under sides that are mostly forked toward their extremities, where they anastomose and form a network of polygonal areolae, the ultimate nervilles terminating in the margin; basilar veinlets of two ranks, the upper or outer ones forked and relatively strong, the lower or inner ones mostly simple, fine, and occasionally anastomosed toward their extremities, all starting from the extreme base of the midrib."

 

Remarks

From Hollick (1930) (p. 94)

"These leaves appear to represent a form intermediate in size between the largest and smallest species of the genus. Their general characters differ but little from those of other species of the genus, and the minor differences are shown more clearly in the figures than it is possible to describe them in words.

A comparison of our figures with the figure of Protophyllum boreale Dawson (1882 [1883]) (p. 28, pl. 4, fig. 13) indicates not only generic but specific identity, and if this apparent identity should be satisfactorily verified the name of our species, under the rules of priority, would become Pseudoprotopliyllum boreale (Dawson) Hollick, n. comb., and this name would also be applied to Dawson's specimen, as discussed on page 91.

Another species that is evidently closely analogous is Protophyllum crenatum (Knowlton 1892) (p. 190, pl. 65, fig. 7) which might be regarded as belonging in the genus Pseudoprotophyllum but the specimen upon which the species is based is too imperfect and too poorly depicted for satisfactory specific comparison.

It is unfortunate that in each of our specimens the upper part is missing, so that the species can not be adequately described, but the basilar characters appear to be sufficiently distinct for its specific differentiation. In particular it may be noted that all the basilar nervilles start from the extreme base of the midrib - none from either side."