SELLARDS.| Fossil Plants, Upper Paleozoic, Kansas. 399 
The surface of the pinnule is thickly covered with a glandular 
structure or short hairs. Midvein of the pinnule marked by 
a flat depression on the upper side, continuing quite or very 
close to the apex, not decurrent at the base, or with a very 
slight downward turn just at its union with the rachis. Lat- 
eral veins at an angle of 45 or 50 degrees, nearly straight or 
slightly arched, usually simple, 7 to 10 on each side of the 
pinnule. 
More or less confusion in regard to the characterization of 
P. arborescens has existed for some time. Zeiller?®> after 
careful study accepts Schlotheim’s differentiation of P. cya- 
thea from P. arborescens; while Potonié from a study of ma- 
terial from the type locality of the two species unites the two 
as synonyms.?*° Zeiller holds that P. cyathea is separated 
from P. arborescens by pinnules more nearly flat, narrower 
in proportion to their length, often unequal, veins often forked. 
Potonié, on the other hand, believes that the large pinnules 
with forked veins are merely the large pinnules of the large 
fronds of P. arborescens. This species is abundant in the 
Upper Coal Measures of Kansas, and is present in the Per- 
mian. The Kansas museum contains a good representation 
of the species from the Coal Measures. It has seemed to me 
from a study of this material that the P. arborescens and 
P. cyathea are distinct. The two pinnules of figure 5, plate 
XLV, are taken from near the base of a pinna about 40 cm. 
long. They should therefore be among the largest pinnules 
of the frond. In these pinnules the veins are always simple. 
Formation and locality: This species is found in abund- 
ance from the Chanute shales through to the Wellington for- 
mation. 
Pecopteris cyathea (Schlotheim) Brongn. 
Felicites cyatheus Schlotheim, Peterfactenkunde, p. 403, 1820. _ 
meee (Schloth.) Brongniart, Hist. Veget. Foss., pl. 10, 
Pecopteris cyathea Schlotheim (sp.), Zeiller, Bassin d’ Autun et 
d’. Epinac, p. 43, pl. 8, figs. 2-4. 
This species is very similar to P. arborescens. The pinnules 
appear to be more nearly flat, narrower in proportion to their 
length, often unequal in length, veins often forked. 
Formation and locality: From the Scranton shales at Scran- 
285. Bassin Houiller et Permien D’Autun et D’Epinae, p. 45, 1890. 
286. Flora des Rothliegenden von Thuringen, p. 57, 1893. 
