USNM 37581 Credneria inordinata Hollick  

Notes

Hollick (1930)

Pl. 57 Fig. 3

 

 

Locality

From Hollick (1930) (p. 86)

"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) (pl. 57, fig. 3)."

 

Locality Map

 

Description

From Hollick (1930) (p. 86)

"Leaves averaging about 10 centimeters in length by about 10 centimeters in width across the expanded upper part, more or less irregular and asymmetric in shape, with an angular, obovate outline, obliquely truncate above and the apex turned slightly to one side; margin serrate-dentate and triangular-dentate, except at the broadly truncate wavy base; nervation pinnate, subpalmate, craspedodrome, consisting of a midrib and four or five irregularly disposed secondary nerves on each side, mostly subopposite, with one or more branches toward their extremities, for the most part from their under sides, lowest pair suprabasilar, with numerous branches on their under sides, mostly forked and extending to the dentitions of the adjacent margin; lamina of the leaf blade below the two basal secondary nerves traversed by a number of relatively strong secondary nervilles that leave the midrib at approximately right angles."

 

Remarks

From Hollick (1930) (p. 86)

"These leaves vary more or less in shape and, to a certain extent, in nervation, but not enough to warrant more than a possible varietal distinction. They are all similar in shape to the general type of lea frepresented by Credneria zenkeri asymmetrica Richter (1905) (p. 12, 5, figs. (47), 5) and C. zenkeri denticulata (Zenker) Richter (1905) (p. 13, pl. 2, figs. 6, 7; pl. 6, figs. 1, 2) but all of our specimens are more irregularly branched than either of these species, and the margins are dentate below as well as above the termini of the basal secondaries. The branching of the basal secondary branches and the craspedodrome characterof these, coincident with the dentition of the adjacent margins, are also distinguishing features. The asyminetry of the upper part of the leaves is well exemplified in Figure 3, Plate 57; and in all our figures it may be seen that the branches of the basal secondaries are markedly different on the opposite sides of each leaf."