Locality
From Hollick (1930) (p. 40-41)
"Yukon River, north bank, about 6 miles above Nahochatilton (original No. 3AH16); collected by Arthur Hollick and Sidney Paige in 1903 (lot 3252)."
Description
From Hollick (1930) (p. 40-41)
"Frond delicate; size and shape not known; pinna linear-lanceolate, pinnate; pinnules triangular, the lower ones pinnatifid, the divisions subtriangular and thumb-shaped, the upper ones gradually diminishing in size and becoming confluent toward the end of the pinna."
Remarks
From Hollick (1930) (p. 40-41)
"This specimen, enlarged in the figure to twice its natural size, represents a fragment of a delicately formed frond, with divisions too small and too obscurely defined for accurate or satisfactory analysis, and it is referred to the genus Stachypteris with some hesitation for the reason that, although it possesses a strong resemblance to Stachypteris litophylla Pomel, as depicted by Saporta (1873; 1891) (text p. 387, atlas pl. 50, figs. 1-5; idem, vol. 4. pl. 289 (63), figs. 2-2b), it is equally suggestive of Scleropteris tenuisecta Saporta (1891) (text p. 425. atlas pl. 280 (54), figs. 2-4; pl. 281 (55), figs. 6-7; pl. 285 (59), figs. 4-6a; pl. 286 (60), figs. 1, 1a, 3- a; pl. 287 (61), figs. 1-4a). Both of these species are Jurassic, whereas our fern is associated with an undoubted Cretaceous flora; but there does not appear to be any described Cretaceous fern species with which it may be as satisfactorily compared as with those mentioned, with the possible exception of Scleropteris vernonensis Ward (1895) (p. 349, pl. 2, figs. 1, 1a, 2, 3) recorded from the 'Mount Vernon series' (Patapsco formation) of the Potomac group of Virginia, which Ward compares with Scleropteris tenuisecta and which Berry (1911) (p. 237) includes in a new genus, Dioksoniopsis. Unless more complete remains of our species are found, however, it will manifestly be impossible to describe and figure it properly, or to venture to identify it positively with any recognized species or genus."