FOSSIL PLANTS. 
401 
Pecopteris Sillimani, Brgt., Veg. foss., p. 
PI. 96, fig. 5 
Un / ^ 
This is one of the rarest species of our Coal Measures. The few specimens 
which I consider referable to it, are small and incomplete ; one of them is from 
Mazon creek, in concretions of clay iron ore. 
Pecopteris Bucklandi, Brgt., Veg. foss., p. 319. /W l . / < 6 - ■ 
PI. 99, fig. 2. 
The specimen representing this species, distinctly shows the character indi¬ 
cated by the author. The pinnae are straight, nearly horizontal (four inches 
long with the end broken off), the leaflets oblong, somewhat lanceolate obtuse, 
but not quite as obtuse as in Brongniart’s figure, slightly scythe-shaped out¬ 
wards, etc. The pinnules are of a thick coriaceous substance, concave, and 
deeply impressed upon the stone. 
Pound in a concretion on Little Vermilion river, by Dr. J. C. Winslow. 
Pecopteris Candolliana, Brgt., Veg. foss., p. 305. 
PI. 100, fig. 1. 
One good distinct specimen, in a concretion from Mazon creek, while nume¬ 
rous specimens from the same locality have branches, with characters interme¬ 
diate between this species and Pecopteris cyatliea of the same author. 
Pecopteris hemiteloides, Brgt., Veg. foss., p. 314. 
PI. 108, fig. 1. 
The specimen from Mazon creek, is half a concretion, representing part of a 
pinna, bearing oblong, slightly pointed leaflets, disconnected at the base, with 
borders inflated, and a double row of large son', unlike any other hitherto seen 
of this genus. These sori open by a transverse solit, agreeing with Brongniart’s 
fig. 2 A in every peculiarity of form. Our specimen does not show any trace 
of nervation. 
—51 
