Pecopteris from Manebach (Thüringen, Germany). This is a real fern.
Lower Permian. Width of the photo 14 cm. There are many species of
Pecopteris: they are probably all foliage of Psaronius trees.
Click for more information on the tree fern Psaronius.

Pecopteris miltoni with visible clusters of sporangia (sori) on the right.
Piesberg, Westfalian D. Height of the photo 8 cm.