SELLARDS.| Fossil Plants, Upper Paleozoic, Kansas. 391 
Pseudopecopteris LESQUEREUX. 
Coal Flora, vol. 1, p. 189, 1880. 
Pseudopecopteris cf. dimorpha Lx. Pl. XLIV, figs. 2, 3; pl. LVI, fig. 1. 
Fronds dense, leaving a thick carbonaceous layer on the 
shale. Ultimate pinnee ovate-lanceolate, alternate, close, 14 to 
1144 cm. apart, sessile, often overlapping, gradually reduced 
in passing to the apex of the frond. Pinnules also crowded, 
alternate, often overlapping, attached by the entire base, open, 
or oblique, irregular in shape, variously lobed or entire, accord- 
ing to their position on the frond. Basal pinnules 8 to 12 or 
more mm. long, divided into three to five ovate or elongate 
lobes, the first of which on the lower side projects over the 
rachis to which the pinnule is attached. Pinnules gradually re- 
duced in passing to the top, becoming near the apex of the 
pinna smaller, less deeply lobed, ovate, the lobes partly con- 
fluent with the small terminal lobe. Pinnules near the middle 
of the pinna constricted at the middle, enlarged at the base and 
to some extent at the apex. The substance of the pinnule is 
thick, the veins thin and immersed in the epidermis. A mid- 
vein is traceable to about or above the middle of the pinnule. 
The lateral veins go off at a sharp angle and curve to the bor- 
ders, dichotomizing two, three or more times; veins numerous, 
fine, and very thin, being almost hidden in the thick leaf sub- 
stance. The species is as yet incompletely known, only a few 
specimens having been obtained, and the comparison with P. 
dimorpha is provisional. 
Formation and locality: Lawrence shales, Twinmound, Up- 
per Coal Measures. 
Pseudopecopteris pluckenetii (Schloth) Lx. Pl. XLIV, fig. 1. 
Felicites pluckenetui Schlotheim, Flora der Forwelt, pl. 10, fig. 9, 
1804. 
Pseudopecopteris pluckenetu (Schloth.), Coal Flora, p. 199. 
The Kansas specimens of this species indicate that the com- 
plete fronds were very large. The main rachis of the frond is 
strong, woody, 22 mm. wide. The primary pinne go off from 
the main rachis at right angles. The rachises of the pinne are 
strong, 20 mm. wide at their union with the main rachis, and 
striate with undulating woody fibers. The rachises are 
throughout round, striated, and, except those of the primary 
and secondary pinnze, bordered by a wing-like extension of the 
lamina. The divisions of the frond are almost or quite at right 
angles, or very slightly inclined; the pinne are rather distant, 
